Soft Magnets

What Is Soft Magnets

Soft magnets are materials that are easily magnetized and demagnetized. They are also known as temporary magnets or electromagnets. They are made from ferromagnetic materials like iron, nickel, cobalt, and their alloys. Soft magnets have low coercivity, which means they require less magnetic field strength to magnetize and demagnetize. Soft magnets are widely used in applications such as electric motors, transformers, generators, and magnetic sensors. They are also used in magnetic shielding to protect sensitive electronic devices from magnetic interference. Unlike hard magnets, soft magnets lose their magnetic properties over time when not exposed to a magnetic field.

Benefits of Soft Magnets

Low Coercivity

Soft magnets have very low coercivity which makes them easy to magnetize and demagnetize.

Low Magnetic Remanence

Soft magnets have low magnetic remanence which means they do not retain a magnetic field after the magnetizing force is removed.

Cost-Effective

Soft magnets are generally less expensive compared to hard magnets and can be manufactured in large quantities at a lower cost.

High Permeability

Soft magnets have high permeability which makes them ideal for use in electromagnetic devices.

Low Hysteresis Losses

Soft magnets have very low hysteresis losses which makes them more efficient and reduces energy losses.

Good Thermal Stability

Soft magnets are stable at high temperatures, which makes them ideal for use in high-temperature applications.

High Corrosion Resistance

Some soft magnets have high corrosion resistance, which makes them ideal for use in harsh environments.

Environmental Friendly

Soft magnets are usually made from low-toxicity materials, and hence, they are considered eco-friendly.

High Electrical Conductivity

Some soft magnets have high electrical conductivity, which makes them useful in electrical and electronic applications.

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Mn-zn Ferrite Core Magnet

Mn-Zn Ferrite Core Magnet are a class of soft magnetic materials that have very good electrical,

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Soft Magnetic Composite Materials

What is Soft Magnetic Composite Materials TSoft Magnetic Composite materials are composite

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Mn-zn Ferrite Core Magnet

1. High magnetic permeability.. 2. Excellent saturation flux density.. 3. Low loss combined with

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MnZn Ferrite Toroid Core

Magnetic cores consisting of a ceramic composition including iron oxide and other metal components

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MnZn Ferrite Core

One must first have a fundamental understanding of ferrites in order to comprehend what MnZn

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SMC Material

Soft magnetic composites (SMCs) which also referred as magnetic powder core, are a soft magnetic

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Soft Magnetic Composite Materials

Magnetic coupling, also called permanent magnetic coupling, is a kind of transmission method which

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Safety In Handling Magnets

Soft magnetic materials are those materials that are easily magnetised and demagnetised. They typically have intrinsic coercivity less than 1000 Am-1. They are used primarily to enhance and/or channel the flux produced by an electric current. The main parameter, often used as a figure of merit for soft magnetic materials, is the relative permeability , which is a measure of how readily the material responds to the applied magnetic field. The other main parameters of interest are the coercivity, the saturation magnetisation and the electrical conductivity.

The types of applications for soft magnetic materials fall into two main categories: AC and DC. In DC applications the material is magnetised in order to perform an operation and then demagnetised at the conclusion of the operation, e.g. an electromagnet on a crane at a scrap yard will be switched on to attract the scrap steel and then switched off to drop the steel. In AC applications the material will be continuously cycled from being magnetised in one direction to the other, throughout the period of operation, e.g. a power supply transformer. A high permeability will be desirable for each type of application but the significance of the other properties varies.

For DC applications the main consideration for material selection is most likely to be the permeability. This would be the case, for example, in shielding applications where the flux must be channelled through the material. Where the material is used to generate a magnetic field or to create a force then the saturation magnetisation may also be significant.

For AC applications the important consideration is how much energy is lost in the system as the material is cycled around its hysteresis loop. The energy loss can originate from three different sources: hysteresis loss, which is related to the area contained within the hysteresis loop; eddy current loss, which is related to the generation of electric currents in the magnetic material and the associated resistive losses and anomalous loss, which is related to the movement of domain walls within the material. Hysteresis losses can be reduced by the reduction of the intrinsic coercivity, with a consequent reduction in the area contained within the hysteresis loop. Eddy current losses can be reduced by decreasing the electrical conductivity of the material and by laminating the material, which has an influence on overall conductivity and is important because of skin effects at higher frequency. Finally, the anomalous losses can be reduced by having a completely homogeneous material, within which there will be no hindrance to the motion of domain walls.

Iron-Silicon Alloys
Amorphous & Nano-Crystalline Alloys
Nickel-Iron Alloys
Soft Ferrites

Some of the Most Common Types of Soft Magnetic Metals and Their Alloys

Iron

A soft iron magnet is a ferrite metal that is easy to work with in various applications. It has a low melting point and is easily magnetized when there is an inducing magnetic field. It is demagnetized when this field is removed.There are two types of magnets: permanent magnets and electromagnets. Permanent magnets do not require electricity, while electromagnets do require electricity to power them so they can create a magnetic field.Soft Iron is also used for rods that make up an electromagnet's soft iron core, which is a core of the electromagnetic coil that helps improve its efficiency.

Soft iron magnet material also combines with other soft magnetic materials to form the semi-hard magnetic materials below.

Iron-Silicone Alloys

Iron-silicone alloys are a type of soft magnet that is made up of iron and silicone. They have high permeability and low coercivity, making them easy to magnetize and demagnetize. They are also resistant to corrosion and have a high resistance to heat, making them ideal for use in industrial furnaces.

Nickel-Iron Alloys

Nickel-iron alloys are another type of soft magnet that is made up of nickel and iron. These alloys have high permeability and low coercivity, making them easy to magnetize and demagnetize. They are also resistant to corrosion and have a high resistance to heat, which makes this alloy suitable for use in industrial furnaces.Each of these materials has unique properties that can be advantageous for different applications. For example, iron is a good choice for low-cost soft magnets, while nickel-iron alloys can create a high permeability material magnet.

Difference between Hard Magnetic Material and Soft Magnetic Material

Basis of Difference	Hard Magnetic Materials	Soft Magnetic Materials
Definition	The magnetic materials that can retain their magnetism even after removal of external magnetic field, and are difficult to magnetized and demagnetized are known as hard magnetic materials.	The magnetic materials that can be easily magnetized and demagnetized are known as soft magnetic materials.
Magnetism	The magnetism of hard magnetic materials is constant.	The magnetism of soft magnetic materials is temporary.
Area of hysteresis loop	For the hard magnetic materials, the area of the hysteresis loop is large.	For the soft magnetic materials, the area of the hysteresis loop is small.
Ease of magnetization	Hard magnetic materials cannot be magnetized easily.	Soft magnetic materials can be easily magnetized.
Coercivity	The coercivity of hard magnetic materials is high.	Soft magnetic materials have relatively low coercivity.
Retentivity	Hard magnetic materials have large value of retentivity.	Soft magnetic materials have small value of retentivity.
Movement of domain walls	The domain walls of the hard magnetic materials do not move easily.	The domain walls of soft magnetic materials can move easily.
Value of H for magnetization	Hard magnetic materials require very large value of magnetizing force (H) for magnetization. It is because, they need comparatively more energy for the movement of domain walls.	Soft magnetic materials require comparatively low value of magnetizing force (H) for magnetization.
Hysteresis loss	Due to large area of hysteresis loop, the hysteresis loss in case of hard magnetic materials is high.	Soft magnetic materials have low hysteresis loss.
Permeability	The permeability of hard magnetic materials is low.	The permeability of soft magnetic materials is high.
Susceptibility	Hard magnetic materials are less susceptible as a result these are less influenced by the external magnetic field.	The susceptibility of soft magnetic materials is high. Consequently, the external magnetic field can easily influence them.
Eddy current loss	Hard magnetic materials have low electrical resistance. As a result, the eddy current loss in these materials is high.	Due to low value of electrical resistance of soft magnetic materials. These materials have less eddy current loss.
Energy stored	Hard magnetic materials can store high energy in the magnetic field.	Soft magnetic materials store less energy in the magnetic field.
Applications	Hard magnetic materials are used in a wide range of applications like in, making permanent magnets, microphones, loudspeakers, motor drives, injection pumps, printers, clocks, measuring instruments, lifting apparatus, robotics, MRI machine and many other medical instruments, etc.	Soft magnetic materials are extensively used in electrical engineering such as for making core the electromagnetics, core of electrical machines like transformer, motor, generator, parts of measuring devices, etc.
Examples	The examples of hard magnetic materials are alnico, ferrites, rare earth cobalt, cobalt platinum, etc.	Some popular examples of soft magnetic materials are pure iron with small carbon content, siliconiron alloy, nickel-iron alloy, etc.

Maintenance Tips for Soft Magnets

Keep them away from strong magnetic fields: Soft magnets are magnets that can be easily demagnetized. They can lose their magnetic properties if they come into contact with strong magnetic fields, such as those produced by magnets used in MRI machines. Therefore, it's important to keep them away from such fields.

Store them in a cool, dry place: Soft magnets can also be affected by temperature and humidity. To prevent them from losing their magnetic properties, store them in a cool, dry place, away from direct sunlight and moisture.

Handle them carefully: Soft magnets are delicate and can be easily damaged if handled roughly. Handle them with care and avoid dropping them.

Use them properly: Soft magnets are not as strong as hard magnets, so don't use them for applications that require strong magnetic fields. Instead, use them for applications that require low or moderate magnetic strength, such as in speakers or motors.

Clean them regularly: Soft magnets can accumulate dirt and dust over time, which can cause them to lose their magnetic properties. You can clean them with a soft cloth or a mild soap solution to remove any dirt or dust. Avoid using abrasive materials or chemicals that can damage the magnet's surface.

Our Factory

Our magnets are mainly applied to motors and generators, such as Servo motors, Linear motors, Wind power generators, Automotive drive motors, Compressor motors, Audio equipment, Home theater, Instrumentation, Medical equipment, Automotive sensors, Wind turbines and Magnetic tools etc.

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FAQ

Q: What limitations do soft magnetic composites have compared with laminations?

A: When compared to laminations, soft magnetic composites do have a few limitations.

SMC components are lower in strength, which translates into limited applications in use as a rotating component. The rapid spinning could crack a brittle component. SMCs are also less permeable, which in select cases may be undesirable, and provide lower magnetic saturation.

Depending on the size of the lamination assembly, pitfalls may spread to run speed, too. A low-complexity lamination assembly may take less time to manufacture than an SMC component.

Finally, in some cases, it may just not be worth the effort to switch to a soft magnetic composite. For example, it's hard to justify using one for a traditional 50/60 HZ motor when a lamination assembly works just fine.

Q: What is the cost of Soft Magnetic Composites?

A: Most roads in manufacturing lead to cost. The big-picture savings in final component cost are significant in powder metallurgy.

Costs will vary from one component to another, with several factors coming into consideration, most of all the component's size and design complexity. Rest assured, though, that soft magnetic composites are cost-effective for most designs. SMC designs require fewer and more manufacturable parts, which takes design consolidation to the next level.

An SMC part can also be combined with a laminate or sintered component, providing innovative design options and unparalleled versatility, all at a smaller price tag.

Don't forget about the copper savings. Designing with SMCs means you can create round corners and compact winding. Copper is a very expensive metal, so this is a big win.

Q: What are the benefits of using soft magnets?

A: Soft magnets are highly efficient, cost-effective and have good magnetic properties.

Q: Can soft magnets be demagnetized?

A: Yes, they can easily be demagnetized using different techniques such as applying an alternating magnetic field or heating them above their Curie temperature.

Q: What type of materials are used to make soft magnets?

A: Soft magnets are made using materials such as iron, cobalt, nickel, and their alloys.

Q: Which applications are suitable for soft magnets?

A: Soft magnets are used in various applications, including motors, transformers, magnetic shielding, and switches.

Q: Can soft magnets be used for industrial purposes?

A: Yes, they are widely used in industrial applications because of their good magnetic properties.

Q: How do soft magnets work?

A: Soft magnets work by aligning their magnetic fields with an external magnetic field. When the external field is removed, the soft magnet's magnetic field returns to its original state.

Q: Why are soft magnets called 'soft'?

A: They are called soft magnets because they are easily magnetized and demagnetized.

Q: What is the advantage of using soft magnets over hard magnets?

A: Soft magnets are more efficient, cost-effective, and easy to manipulate compared to hard magnets.

Q: What are the different types of soft magnets?

A: The different types of soft magnets include pure iron, ferrites, powder cores, and amorphous alloys.

Q: What is the Curie temperature of soft magnets?

A: The Curie temperature of soft magnets varies depending on the material used in its manufacturing.

Q: What is the most commonly used soft magnetic material?

A: Iron is the most commonly used soft magnetic material.

Q: Can soft magnets be made into different shapes?

A: Yes, they can be made into different shapes, including sheets, strips, wires, and cores.

Q: Are soft magnets environmentally friendly?

A: Yes, they are environmentally friendly as they do not contain toxic materials.

Q: Do soft magnets lose their magnetic properties over time?

A: Soft magnets tend to lose their magnetic properties over time due to several factors, including temperature, corrosion, and aging.

Q: What is the difference between soft magnetic materials and permanent magnets?

A: Permanent magnets have a high coercive force, meaning they do not easily lose their magnetic properties, unlike soft magnetic materials.

Q: How are soft magnets tested for their magnetic properties?

A: Soft magnets are tested for their magnetic properties using several techniques such as magnetic hysteresis measurements and magnetic flux density measurements.

Q: Can soft magnets be customized according to specific requirements?

A: Yes, soft magnets can be customized according to specific requirements based on the application.

Q: Are soft magnets safe to use?

A: Yes, soft magnets are safe to use as they do not emit harmful radiation or pose any health risks.

Chongqing Great Wall Technology Co., Ltd. is well-known as one of the leading soft magnets manufacturers and suppliers in China. Please feel free to buy or wholesale high quality soft magnets made in China here from our factory. For customized service, contact us now.

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