# US 11,309,485 B2 · Magnetostrictive material and magnetostriction type device using the same

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- Number: US 11,309,485 B2
- Document ID: US11309485B2
- Status: Granted
- Kind: B2
- Application number: 16/275,235
- Filed: 2019-02-13
- Published: 2019-09-26
- Granted: 2022-04-19
- Earliest claimed: 2018-03-26
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Takehiro Tanaka; Kazuki Sakai; Taichi Nakamura; Ryou Kuwabara
- Web page: https://patentgrep.com/patent/US11309485B2

## CPC

- H10N 35/85: Magnetostrictive active materials
- C22C 38/002: {containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60}
- C22C 38/005: {containing rare earths, i.e. Sc, Y, Lanthanides}
- C22C 2202/02: Magnetic
- G01L 3/103: {Details about the magnetic material used}
- H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G)

## Abstract

A magnetostrictive material includes a FeGaSm alloy that is represented by Expression (1), Fe(100-x-y)GaxSmy (1) (in Expression (1), x and y are respectively a content rate (at. %) of Ga and a content rate (at. %) of Sm, and satisfy that y≤0.35x−4.2, y≤−x+20.1, and y≥−0.1x+2.1).

## Claims

### Claim 1

A magnetostrictive material comprising:
a FeGaSm alloy that is represented by Expression (1),
Fe(100-x-y)GaxSmy (1)
wherein, in Expression (1), x and y are respectively a content rate (at. %) of Ga and a content rate (at. %) of Sm, and satisfy 17≤x≤18 and 0.7≤y≤1.4, and
wherein the magnetostrictive material has a magnetostriction quantity of 480 ppm or greater.

### Claim 2 (depends on 1)

The magnetostrictive material of claim 1,
wherein an orientation difference of <100> orientation of the FeGaSm alloy is in a range of 0° or greater and 10° or less, with respect to a maximum strain direction of the magnetostrictive material.

### Claim 3 (depends on 2)

A magnetostriction type device comprising:
the magnetostrictive material of claim 2,
wherein a maximum strain direction of the magnetostrictive material is configured to form an inclination angle of 0° or greater and 10° or less, with respect to a predetermined direction of a dimensional change of the magnetostriction type device.

### Claim 4 (depends on 1)

A magnetostriction type device comprising:
the magnetostrictive material of claim 1,
wherein a maximum strain direction of the magnetostrictive material is configured to form an inclination angle of 0° or greater and 10° or less, with respect to a predetermined direction of a dimensional change of the magnetostriction type device.