Permalloy - SDM Magnetics Co., Ltd.

Ι What Is Permalloy?

Permalloy refers to nickel-iron soft magnetic alloys, specifically binary or multicomponent nickel-iron-based alloys with 34% to 84% nickel content. Since its invention, permalloy has emerged as the most extensively used soft magnetic alloy, recognized for its exceptionally high magnetic permeability and diverse compositions. Its magnetic properties can be tailored through composition adjustments and heat treatment processes, making permalloy ideal for use as a magnetic core material and a magnetic shielding material to obstruct magnetic fields.

Additionally, permalloy exhibits key magnetic properties like low coercivity, near-zero magnetostriction, and notable anisotropic magnetoresistance. These characteristics allow permalloy to perform effectively in pulse transformers needing low remanence and stable permeability, as well as in rectangular magnetic alloys, thermomagnetic alloys, and magnetostrictive alloys, supporting a variety of specialized magnetic applications.

Electromagnetic Properties of Permalloy

In the Chinese nomenclature system, Permalloy grades are specified by the format 1 + letter J + two numbers. The numeral 1 indicates a soft magnetic material. The letter J signifies a precision alloy with special physical properties. The two numbers at the end represent the nickel content in the alloy, such as 1J50 and 1J85.

Electromagnetic Properties Chart of High Permeability Alloy

High permeability alloys exhibit elevated initial magnetic permeability in weak magnetic fields. High permeability alloys are frequently utilized in sensitive magnetic components, probes, electronic transformers, magnetic shielding, amplifiers, transducers, converters, micro motors, and as core materials for recording heads in audio and video equipment, supporting diverse technological applications.

Grade	Condition	Level	Thickness/Diameter	Initial magnetic permeability μ0.08 (mH/m)	Maximum permeability μ_max (mH/m)	Coercivity Hc (A/m)	Saturated magnetic flux density Bs (T)
1J50	Tape	II	0.10-0.19	≥3.8	≥43.8	≤12	1.5
			0.20-0.39	≥4.4	≥56.3	≤10.4
			0.35-0.50	≥5.0	≥65	≤8.8
			0.51-1.00	≥5.0	≥50	≤10
			1.10-2.50	≥3.8	≥44	≤12
		I	0.05-0.20	≥12.5	≥75	≤4.8	1.52
	Bar	–	10-100	3.1	31.3	14.4	1.5
1J79	Tape	II	0.005	15	75	4.8	0.75
			0.01	20	110	3.2
			0.02-0.04	25	125	2.4
			0.05-0.09	25	150	1.6
			0.10-0.19	28	190	1.2
			0.20-0.34	31	250	1.2
			0.35-1.00	38	280	1
			1.10-2.50	31	230	1.2
		III	0.01	25	150	2.4	0.73
			0.02-0.04	31	190	1.6
			0.05-0.09	38	250	1.2
			0.10-0.19	38	250	1.2
			0.20-0.34	38	280	1
			0.35	44	310	1
	Bar	–	10-100	25	125	2.4	0.75
1J85	Tape	II	0.02-0.04	37.5	137.5	2.4	0.70
			0.05-0.09	50	175	1.6
			0.10-0.19	62.5	225	1.2
			0.20-0.34	75	250	1
			0.35	68.8	325	0.7
	Bar	–	10-100	37.5	125	1.6

Electromagnetic Properties Chart of Rectangular Magnetic Alloy

Rectangular magnetic materials, soft magnetic alloys, exhibit a rectangular hysteresis loop. These rectangular magnetic materials feature a high Br/Bm ratio (≥0.85) of residual to maximum magnetic flux density during operation, with relatively low coercive force. Rectangular magnetic materials are mainly used in medium and low power magnetic amplifiers, pulse transformers, magnetic modulators, contactless relays, rectifier rings, chokes, modulators, and as components in magnetic core memories for computers and electronic instruments.

Grade	Condition	Maximum permeability μ_max (mH/m)	Squareness ratio Br/Bm	Coercivity Hc (A/m)	Saturated magnetic flux density Bs (T)
1J34	Tape	≥137.5	≥0.87	≤8	1.5
1J51	Tape	≥50.0	≥0.85	≤18	1.5
Note: Electromagnetic properties of 1J34 are given based on the tape with a thickness of 0.10-0.20mm. Electromagnetic properties of 1J51 are given based on the tape with a thickness of 0.10mm.

Electromagnetic Properties Chart of Magnetic Temperature Compensation Alloy

Magnetic temperature compensation alloys are soft magnetic alloys with a Curie temperature close to room temperature, where magnetic induction intensity drops sharply and nearly linearly as temperature rises. These magnetic temperature compensation alloys serve mainly as magnetic shunt compensation components in devices with permanent magnets, including traveling wave tubes, magnetrons, anemometers, voltage regulators, odometers, fuel gauges, and electric meters, ensuring stable performance.

Grade	Condition	Magnetic flux density B under 8000A/m
Grade	Condition	-20℃	20℃	40℃	60℃	80℃
1J30	Tape	0.40-0.60	0.20-0.45	–	0.02-0.13	–
1J31		0.60-0.85	0.40-0.65	–	0.15-0.45	–
1J32		0.80-1.10	0.60-0.95	–	0.40-0.75	–
1J33		–	0.40-0.70	–	–	0.10-0.40
1J38		0.25-0.42	0.05-0.24	-0.015-0.120	–	–
Note: The above-mentioned data of electromagnetic properties are given based on the tape with a thickness of 0.1-1.00mm.

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November 21, 2025