マイクロ・マグネット

Precision micro magnets, or miniature magnets, have dimensions typically below one millimeter. They find use in various applications, such as sensors for detecting and measuring physical properties like magnetic fields, temperature, pressure, and acceleration. These magnets are produced using powder metallurgy and ceramic technology and play a significant role in imaging precision, medical therapies, and minimally invasive procedures.

Precision Micro Magnets

Neomagnets specializes in the precision machining of hard and brittle magnetic materials to create high-precision micromagnets.

Material: Neodymium, SmCo, Alnico, Ferrite

Minimiun Wall: 0.15mm (150 µm)

Minimium Size: 0.2*0.2mm (200 µm)

Minimum tube: 0.38*0.14 *2 mm

Micro Magnets Definition

Micro magnets, also referred to as miniature magnets, are permanent magnets with dimensions typically below one millimeter, often requiring a dimension below 0.50mm. A variety of materials, such as FeCrCo, Samarium-Cobalt, Alnico magnets, and N55 grade neodymium magnets, can be used to make them. Neodymium magnets are the most preferred due to their superior magnetic performance.

However, they are prone to corrosion, so surface coating is necessary. One of the challenges of manufacturing micro neodymium magnets is surface coating. In medical applications, special coatings such as TiN, Au, and Parylene are required. Samarium Cobalt magnets are well-known for their excellent temperature resistance and stability, whereas AlNiCo magnets are commonly used for their temperature stability.

Micro magnets photo view

Micro Magnets Dimensions

To make scientific topics easier to understand, we divide the most miniature magnets into two dimensions:

• Small magnets (Little magnets): 1.00 – 2.00 mm (3/64 – 5/64 inch)
• Micro magnets (Tiny magnets): 0.20 – 0.99 mm (200μm-990μm,1/64 – 1/32 inch) 

The popularity of micro neodymium magnets is increasing in various industries, including consumer electronics, automotive, medical devices, and micro robotics. This trend is due to advancements in manufacturing technologies that allow for increasingly compact designs. Micro neodymium magnets are essential in reducing the overall size of these products and have even been used in previously unimaginable applications.

One example is Minimally Invasive Surgery (MIS). In procedures involving coronary arteries, which are only 3-4 mm in diameter, the required magnet diameter is 1.35 mm or smaller. Micro neodymium magnets are versatile and precise, unlocking new possibilities in various fields.

Minimally Invasive Surgery

Video Introduction

💡 Micro magnets can demonstrate impressive magnetic effects despite their small size.
🔬 Precision is crucial in manipulating and observing the behavior of micro magnets.
🧲 Magnetic fields are significant in various applications, including technology and medical devices.
📏 Accurate measurement and control of micro magnets are essential for their practical applications.

Play Video about micro magnets video introduction

マイクロマグネットの用途

The realm of micro magnets stretches across myriad sectors, such as healthcare and electronics, thanks to their superior physical and chemical characteristics.

Healthcare Applications

Micro magnets are making a groundbreaking impact on healthcare, transforming care delivery through improved imaging, targeted therapy, precise diagnostics, clot management, and guidance in minimally invasive surgeries. They play a significant part in enhancing the accuracy of imaging techniques, delivering focused, therapeutic interventions, and pioneering diagnostic procedures, especially concerning cardiac care. Neodymium magnets, noted for their intense magnetic field potency, are embedded within various diagnostic apparatus and employed as therapeutic agents, albeit with a caveat regarding their potential risks and an underscored need for deeper investigation into their health implications. Additionally, these microscopic magnets are integral to medical implants and the directional maneuvering of catheters, underlining their importance in contemporary medical practice.

Electronics and Computing

In the realm of consumer electronics and computation, micro magnets are indispensable. They are foundational to operating sensors, motors, couplings, interconnects, and sound-producing appliances. Their smartphone deployment is particularly remarkable—miniature NdFeB magnets are critical to the functionality of speakers, earpieces, vibration engines, haptic feedback modules, and precision camera focusing mechanisms. Moreover, the potentiality to harvest energy from the vibration of these mini magnets supplies an innovative method for energizing wire-free sensors.

Microrobotics

The rapid progression in micro-robotics has led to the widespread application of magnetically driven micro- and nanorobots across several domains. Such robots, mobilized by magnetic fields, are capable of controlled locomotion, pinpointed delivery of payloads, and the conveyance of energy. The advent of electromagnetic micromixers, which employ external permanent magnets and electromagnets, emphasizes micro magnets’ adaptability in propelling the boundaries of technological advancements.

Crafting and Jewelry

In the crafting world, micro magnets are popular for their ability to provide strong, unobtrusive closures in jewelry or as fastening mechanisms in leather goods and textiles.

Automotive

The automotive industry uses micro magnets in various sensors and electric motors. They play a crucial role in modern vehicles, from electric power steering systems to anti-lock braking system (ABS) sensors.

Wearable Technology

They are widely used in wearable technology for securing mechanisms and as connectors for charging cables.

Energy

Magnets have a role in the clean energy sector, particularly in improving the efficiency of wind turbine generators and in the development of magnetic refrigeration technology.

Research and Development

The strong fields of micro magnets make them invaluable in research for manipulating and controlling tiny magnetic particles, which has applications in physics and material science experiments.

Features of Micro Magnets

It can be challenging to produce custom micro magnets and obtain supply information. When searching on major B2B websites, the results typically display small magnets several millimeters in size rather than micro magnets.

Only a few magnet manufacturers nationwide can produce such small magnets with unique shapes, such as those with irregular forms or holes drilled into them (as shown in the picture below).

We specialize in custom neodymium magnet production, focusing on micro magnets. Our micro magnets are available in a variety of materials, including Neodymium Iron Boron, Samarium Cobalt, Ferrite, FeCrCo, and Alnico.

マイクロマグネットサイズ

Measurement Unit

Many individuals use the same measurement unit as standard magnets. They are both millimeters. For example, the disc magnet can be described as 5*5mm. The dimensions of the block magnet are 5*6*9mm. (Please keep in mind that the last number represents magnetic orientation.)

On the other hand, scholars like to use m to quantify magnets in science studies. as in Yue Wang’s article “A tiny electromagnetic actuator with high force density.”

Minimum Dimensions Of Micro Neodymium Magnets

As a custom magnet supplier, we can produce micro magnets with the dimensions below.

• Minimum block: 0.2*0.2*0.2 mm

• Minimum disc: 0.2*0.2 mm

• Minimum tube: 0.38*0.14 *2 mm

• Tolerances: between +/- 0.005mm and +/- 0.020 mm

• Minimum hole diameter: 0.10 mm

The giant thin magnet we made is 50*50*0.2mm (This is a big challenge)

Grades of Micro Magnets

Neodymium magnets are graded based on the strength of their magnetic field. The grade of a neodymium magnet is indicated by a number, with a higher number indicating a stronger magnetic field. These magnets have various grades, ranging from N35 to N55, and also have high-temperature grades for special applications, such as H, M, SH, EH, and AH. To determine the most appropriate grade for your needs, refer to our introduction to neodymium magnet grades.

When selecting micro neodymium magnets, it is recommended to choose those with the top grades – N52, N54, and N55 – due to their superior technical capabilities. This is because smaller magnets may not provide optimal magnetism if they have lower grades. Additionally, magnets with lower grades are more challenging to process and prone to damage during use. Therefore, it is more logical to choose micro magnets with the top grades rather than lower grades.

Coatings of Micro Magnets

Neodymium magnets are susceptible to corrosion in certain environments, including high humidity and exposure to corrosive elements. To enhance their durability, applying one or multiple layers of coating to their surfaces is recommended. This will also increase their resistance to scratches and other types of damage.

Neo Magnets provides custom neodymium magnets with various coating options to choose from. Nickel, Zinc, epoxy, and Parylene are the coatings available for neodymium magnets, each with unique properties and benefits. Please refer to the neodymium-magnet coating guide to select the most appropriate coating for your magnets.

Since micro neodymium magnets are already small, so they require high precision to function properly. Therefore, customers must consider the tolerance of different coatings to avoid any negative impact on the magnets’ precision.

The coating thickness must be uniform in certain cases despite the inherent challenges of achieving this with certain coating techniques. If you have specific requirements for the roughness and tolerance of the magnet surface, please do not hesitate to contact us.

Costs For Micro Neodymium Magnets

Individuals wonder why micromagnets are more costly than regular magnets. Miniature magnets use significantly less substance than ordinary magnets.
Is it the producer who earns a lot of money?
Here are three reasons why tiny neodymium magnets are more expensive.

Hard To Process

Nano magnets are more difficult to manufacture because they are too tiny to manage correctly. They will necessitate specific fittings and extra care. The most difficult tasks are cutting and finishing. It may take longer to modify and fine-tune machinery. In some severe instances, we require 7 hours of physical labor to create the first certified micromagnet.

The majority of the processes necessitate the physical processing of the magnets, resulting in decreased output. This also increases manufacturing expenses.

High Wastage

During manufacturing, micromagnets have a significantly greater failure rate. Sometimes, we must make 800 – 2,000 parts to get 50 approved magnets. Their basic materials are costly N52, N54, or N55.

Most faulty magnets occur when employees start-up and fine-tune the equipment. Miniature neodymium magnets are insufficiently tiny and fragile. The magnets will be faulty or even harmed even if the working power is marginally more significant.

Special Instruments

Micro magnets cannot be manufactured in the same factories as ordinary magnets. Their forbearance will be more than adequate. As a result, we’ll need to employ some specialized equipment. We also have a Quadratic element measure to ensure that the measurements are correct and that the product meets the client’s needs.

Excellent Skilled Workers

Many of the processes for making tiny magnets are done by hand. Although automatic machines have made great strides, they can still not make some precision bespoke magnets. People employees are still more adaptable to the demands of actual work.

Neo Magnets has been steadily increasing our capacity to produce a wider variety of micron magnets, and we can now handle 0.2 mm magnets.

We always provide high-quality, long-term-stability goods. We have made significant progress in this area.

Our goods, particularly our deep-hole thin magnetic bands, find widespread application in timepieces, timers, micro-motors, meters, optical transmission, and other areas.

We can also create a new style based on the customer’s sketch and specifications. Many clients are pleased with our superior methods in magnetic tubes, magnetic cylinders, columnar magnets, magnetic conduit, hole magnets, magnetic pipelines, pipe magnets, tube magnets, Cylinder magnets, deep hole magnets, and other applications.

Why Choose Us as Micro Magnet Supplier

Superior Strength

Our micro magnets boast high magnetic strength relative to their size, you can enjoy strong holding and coupling forces without the bulk of larger magnets.

Precision Engineering

Each magnet is manufactured with stringent tolerances, ensuring consistent performance and reliability in sensitive applications where precision is paramount.

Customizable

We offer customizable magnet solutions to fit specific project requirements, ensuring that you have the right magnet for your applications.

費用対効果

The efficiency and durability of our micro magnets make them a cost-effective choice over other alternatives that may require more frequent replacement or larger, more expensive solutions.

Quality Assurance

Each batch of micro magnets is subjected to rigorous quality control checks to guarantee that you receive a product that meets high-quality standards.

Our Micro Magnets Quality and Safety Information

We promise the quality of our magnets product and our commitment to safety and customer well-being. We proudly provide the following:

Quality Standards

Our micro magnets embody the pinnacle of quality, adhering to the internationally recognized ISO 9001 quality management system, ensuring each magnet we produce adheres to the most exacting standards. In adherence to ASTM standards for magnetic materials, our magnets are guaranteed to be reliable and perform consistently across all applications.

We employ rigorous testing for magnetic strength, dimension accuracy, and coating durability during manufacturing to guarantee superior performance and longevity. Our micro magnets comply with specific regulatory standards for sensitive applications in the medical and aerospace industries, ensuring safety and effectiveness in even the most demanding environments.

Safety Information

Recognizing the power of the magnetic fields our micro magnets produce is essential. They can disrupt pacemakers and interfere with magnetic storage or other sensitive electronic equipment. We advise handling these magnets with extreme care to avoid the risk of injury caused by their intense attraction, which can snap the magnets together with great force.

For safety, store the magnets in a secure area to prevent unintended attachment to ferrous materials and keep them away from items vulnerable to magnetic fields. Usage guidelines include avoiding exposure to high temperatures to protect against demagnetization and taking care to prevent potentially damaging impacts. These precautions are crucial to maintain their integrity and performance, particularly for brittle magnet types like neodymium.

Material Safety Data Sheet (MSDS) Example

SectionContent
1: Chemical Product and Company Identification

Product Name: マイクロ・マグネット

Manufacturer: ネオ・マグネット

Address: [Company Address]

Emergency Contact: [Phone Number]

MSDS Date: [Date]

2: Hazards IdentificationMagnetic Hazard, Physical Hazard, Chemical Hazard
3: Composition/IngredientsNeodymium (Nd), Iron (Fe), Boron (B)
4: First-Aid MeasuresInhalation: Fresh air, rest, medical attention. Ingestion: Rinse, medical attention. Skin Contact: Gentle separation, medical help if needed. Eye Contact: Flush with water, medical help as necessary.
5: Fire-Fighting MeasuresUse extinguishing media suitable for surrounding fire; wear protective gear.
6: Accidental Release MeasuresCollect with non-magnetic tools for reclaim/disposal.
7: Handling and StorageHandle with tools; store away from sensitive devices, ferromagnetic materials, and heat.
8: Exposure Controls/Personal ProtectionSafety equipment when handling magnet dust/shavings.
9: Physical and Chemical PropertiesSolid, Metallic, Odorless, Strong permanent magnetism
10: Stability and ReactivityStable; avoid high temperature and mechanical shock.
11: Toxicological InformationInhalation or ingestion: respiratory distress, indigestion.
12: Ecological InformationNot regarded as dangerous, avoid release to the environment.
13: Disposal ConsiderationsDispose of or recycle according to regulations.
14: Transport InformationTransport with caution due to magnetic fields.
15: Regulatory InformationComply with material-specific and national regulations.
16: Other InformationAdditional notes, references, preparation date

Handling Guidelines for Micro Magnets

General Handling Instructions

  1. Using Appropriate Tools: When manipulating micro magnets, use non-magnetic tools such as tweezers or plastic forceps to prevent unintentional snapping together, which could result in injury or damage to the magnets.
  2. Protective Gloves: Wear protective gloves to reduce direct skin contact and minimize the risk of pinching your fingers between magnets. Gloves can also prevent oils from your skin from corroding the magnets.
  3. Controlled Environment: Perform handling of micro magnets in a controlled space, free of clutter, and away from sensitive electronic devices to avoid magnetic interference or loss of small magnets.

Separating Magnets

  1. Plastic Spacers: Always keep plastic spacers between the micro magnets when not in use. Spacers will make picking up a single magnet at a time easier and prevent the strong magnetic force from snapping them together unexpectedly.
  2. Dedicated Separation Tools: For larger and stronger magnets, use a dedicated magnet-separating tool to provide leverage and safely separate one magnet from another without causing injury.
  3. Sliding Technique: Instead of pulling two magnets directly apart, slide them away from each other to avoid finger injuries and to maintain the integrity of the magnets.
  4. Caution with Snap-Together Forces: Be aware of the magnets’ snap-together forces; they can be powerful and could result in sudden impact that can cause injuries or chip the magnets.

Transport and Storage

  1. Secure Packaging: Store and transport the micro magnets in secure packaging to prevent them from attracting metal objects or each other, which could lead to demagnetization or damage from forceful contact.
  2. Distinct Storage Areas: Keep magnets stored in a clearly labeled area to warn others of the potential risks of strong magnetic fields.

Preventing Damage to Magnets

  1. Surface Protection: Avoid dropping magnets onto hard surfaces to prevent chipping or cracking. Surfaces for magnet handling should be padded to minimize the impact if a magnet is dropped.
  2. Avoid High Temperatures: Store micro magnets away from high-heat environments that could demagnetize them, and do not expose them to open flames or soldering irons.

Cautionary Measures

  1. Interference with Electronics: Keep magnets away from devices that can be affected by magnetic fields, such as credit cards, computer hard drives, mechanical watches, hearing aids, and pacemakers.
  2. Children: Ensure that children do not handle micro magnets, as they can be dangerous if ingested and present a choking hazard. Similarly, keep them away from pets for the same reasons.

Protective Packaging for Micro Magnets

To ensure the safety and integrity of micro magnets during shipping and handling, it is essential to employ a protective packaging strategy that addresses their magnetic properties and physical delicacy. Here’s how such a product might be securely packaged:

  1. Foam-Lined Boxes: Each set of micro magnets is encased in a foam-lined box with individual magnet cutouts. This prevents the magnets from moving around and snapping together and provides cushioning to protect against impacts.
  2. Magnet Isolation: Small plastic or cardboard spacers are placed between individual magnets within the foam cutouts to minimize the risk of attraction and collision between magnets inside the package.
  3. Shielded Containers: In cases where the magnetic field might interfere with external devices, the boxes may be made of materials that provide magnetic shielding.
  4. Secure Closure: The boxes are securely closed with latches or locks that ensure the magnets remain within the protective foam during transit, even if the package is bumped or dropped.
  5. Outer Packaging: The foam-lined boxes are then placed in a strong, hard-shell outer box, which might be constructed from rigid plastic or reinforced cardboard to provide additional protection.
  6. Sealed and Labeled: The outer box is sealed with tamper-evident tape and clearly labeled with handling instructions and warnings about the magnetic contents. This informs courier services and handlers of the need for careful handling and alerts to the presence of strong magnets.
  7. Dampening Materials: Additional dampening materials, such as bubble wrap or air pillows, fill any remaining space in the outer box, preventing movement that could lead to damage.
  8. Magnetic Field Safety Check: Upon packaging completion, a check is performed with a magnetic field detector around the package to ensure that the field strength at the surface of the shipping container is at safe levels to prevent any possible interference with shipping and handling equipment.
  9. Regulatory Compliance: The packaging also complies with any shipping regulations for magnets, such as those by the International Air Transport Association (IATA) for air shipments, which may dictate specific labeling and packaging requirements based on the strength of the magnetic field.

Where To Buy Micro Magnets?

Micro magnets are available for purchase from Neo Magnets, who have an advantage in producing these tiny magnets.

Contact us to buy micro magnets for your research institute, university, or company.

Micro Magnet FAQs

Our experience shows that these powerful mini magnets are used in medical products, aircraft instrument sensors, and microrobotics.

  • In medicine, they enable targeted drug delivery and enhance surgical instruments for less invasive procedures.
  • In microrobotics, they function as actuators for precise movement and are integral to sensing and control systems, allowing for accurate navigation and positioning.

Micromagnets offer precise control and increased efficiency in these applications, resulting in improved patient outcomes and expanded possibilities in both fields.

The best coating for micro magnets in clinical applications is Parylene. many medical cases, customers choose Parylene.

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