Granted Patent B2

US 12,641,914 · App. 17/845,050 · Granted May 26, 2026

Inventors: Takekazu Yamane (Tokyo, JP); Hideaki Fukuzawa (Tokyo, JP); Tetsuya Shibata (Tokyo, JP); Tomohito Mizuno (Tokyo, JP)

Assignee: TDK CORPORATION

H10F77/40H01F10/3254G01R33/0052

Abstract

Claims (45)

1 . A light detection element comprising:

a plurality of magnetic elements, and

an optical device,

wherein each of the magnetic elements includes a first ferromagnetic layer that is irradiated with light and a second ferromagnetic layer and a spacer layer sandwiched between the first ferromagnetic layer and the second ferromagnetic layer, and

wherein at least two of the magnetic elements are arranged to be inside a spot of the light from the optical device applied to the first ferromagnetic layers of the at least two of the magnetic elements.

2 . The light detection element according to claim 1 ,

wherein the magnetic elements include a first magnetic element and a second magnetic element arranged to be inside the spot, and

wherein the first magnetic element and the second magnetic element have a different volume of the first ferromagnetic layer.

3 . The light detection element according to claim 2 ,

wherein the first magnetic element is closer to a center of the spot than the second magnetic element, and

wherein the first magnetic element has a larger volume of the first ferromagnetic layer than that of the second magnetic element.

4 . The light detection element according to claim 1 ,

wherein the magnetic elements include a first magnetic element and a second magnetic element arranged to be inside the spot, and

wherein the first magnetic element and the second magnetic element have different saturation magnetization of the first ferromagnetic layer.

5 . The light detection element according to claim 4 ,

wherein the first magnetic element is closer to a center of the spot than the second magnetic element, and

wherein the first magnetic element has larger saturation magnetization of the first ferromagnetic layer than that of the second magnetic element.

6 . The light detection element according to claim 1 ,

wherein the magnetic elements include a third magnetic element and a fourth magnetic element arranged to be inside the spot,

the light detection element further includes a first intermediate layer between the first ferromagnetic layer of the third magnetic element and a light irradiation surface that is a surface on a side irradiated with the light of the light detection element, and

the light detection element further includes a second intermediate layer between the first ferromagnetic layer of the fourth magnetic element and the light irradiation surface,

wherein the third magnetic element is closer to the light irradiation surface than the fourth magnetic element, and

wherein the third magnetic element has a larger volume of the first ferromagnetic layer than that of the fourth magnetic element.

7 . The light detection element according to claim 1 ,

wherein the magnetic elements include a third magnetic element and a fourth magnetic element arranged to be inside the spot,

the light detection element further includes a first intermediate layer between the first ferromagnetic layer of the third magnetic element and a light irradiation surface that is a surface on a side irradiated with the light of the light detection element, and

the light detection element further includes a second intermediate layer between the first ferromagnetic layer of the fourth magnetic element and the light irradiation surface,

wherein the third magnetic element is closer to the light irradiation surface than the fourth magnetic element, and

wherein the third magnetic element has larger saturation magnetization of the first ferromagnetic layer than that of the fourth magnetic element.

8 . The light detection element according to claim 1 ,

wherein the magnetic elements include a fifth magnetic element and a sixth magnetic element arranged to be inside the spot,

wherein the fifth magnetic element is closer to the center of the spot than the sixth magnetic element,

the light detection element further includes a third intermediate layer between the first ferromagnetic layer of the fifth magnetic element and a light irradiation surface that is a surface on a side irradiated with the light of the light detection element, and

the light detection element further includes a fourth intermediate layer between the first ferromagnetic layer of the sixth magnetic element and the light irradiation surface, and

wherein the fourth intermediate layer has higher transmittance of the light than that of the third intermediate layer.

9 . A receiving device comprising:

the light detection element according to claim 1 .

10 . A light sensor device comprising:

the light detection element according to claim 1 .

11 . The light detection element according to claim 1 ,

wherein, when an intensity of the light applied to the first ferromagnetic layer increases, a magnetization of the first ferromagnetic layer is inclined from the initial state by an external energy according to the application of the light.

12 . The light detection element according to claim 1 ,

wherein, a magnitude of a magnetization of the first ferromagnetic layer decreases from an initial state by an external energy according to the application of light when an intensity of the light applied to the first ferromagnetic layer increases.

13 . The light detection element according to claim 1 ,

wherein the optical device is larger than the spot of the light.

Assignments (1)

Priority Claims (2)

Continuity (1)

References Cited (62)