Patent ID: 11971315
Assignee: DAEGU GYEONGBUK INSTITUTE OF SCIENCE AND TECHNOLOGY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A force sensor, comprising:
a first permanent magnet layer;
a magnetic tunnel junction disposed on the first permanent magnet layer and configured to have a preset resistance value; and
a second permanent magnet layer disposed to be spaced apart from the magnetic tunnel junction,
wherein the second permanent magnet layer moves in a direction of the first permanent magnet layer when a pressure is applied from outside, the preset resistance value of the magnetic tunnel junction is changed when a magnetic field strength formed between the first permanent magnet layer and the second permanent magnet layer becomes a preset strength or more according to a movement of the second permanent magnet layer, and the force sensor senses the pressure based on a change in the preset resistance value, and
wherein the magnetic tunnel junction comprises a first electrode layer disposed on the first permanent magnet layer; a first perpendicular magnetic layer disposed on the first electrode layer and magnetized in a first direction; a tunnel layer disposed on the first perpendicular magnetic layer; a second perpendicular magnetic layer disposed on the tunnel layer and magnetized in a second direction opposite to the first direction; an insertion layer disposed on the second perpendicular magnetic layer; a third perpendicular magnetic layer disposed on the insertion layer and magnetized in the first direction; and a second electrode layer disposed on the third perpendicular magnetic layer.