Spin torque oscillator with high power output and its applications
AssigneeInstitute of Physics, Chinese Academy of Sciences
InventorsHongxiang Wei, Jiafeng Feng, Xiaoguang Zhang, Houfang Liu, Xiufeng Han
Life of this patent
Estimating the term…
Abstract
The present invention relates to a spin torque oscillator with high power output and its applications. A spin torque oscillator may include a first magnetic reference layer having a fixed magnetization, a magnetic precession layer having a magnetization capable of precessing about an initial direction, and a first barrier layer interposed between the first magnetic reference layer and the magnetic precession layer. The first barrier layer is formed of an insulating material capable of inducing a negative differential resistance for the spin torque oscillator.
Claims20
A spin torque oscillator comprising:
- a first magnetic reference layer having a fixed magnetization;
- a magnetic precession layer having a magnetization capable of precessing about an initial direction;
- and
- a first barrier layer interposed between the first magnetic reference layer and the magnetic precession layer, the first barrier layer being formed of an insulating material capable of inducing a negative differential resistance for the spin torque oscillator.
A spin torque oscillator circuit comprising:
- a first magnetic tunnel junction generating an oscillating signal under a direct current (DC) bias, the first magnetic tunnel junction comprising:
- a first magnetic reference layer having a fixed magnetization;
- a magnetic precession layer having a magnetization capable of precessing about an initial direction under the DC bias;
- and
- a first barrier layer interposed between the first magnetic reference layer and the magnetic precession layer, the first barrier layer being formed of an insulating material capable of inducing a negative differential resistance under the DC bias;
- and
- at least one amplifying circuit receiving and amplifying the oscillating signal generated by the first magnetic tunnel junction, each of the at least one amplifying circuit comprising a resistor and a second magnetic tunnel junction connected in series between a supply voltage and a ground potential, the second magnetic tunnel junction having a negative differential resistance under biasing of the supply voltage, the oscillating signal being applied to a supply voltage side of the at least one amplifying circuit, and the at least one amplifying circuit providing the amplified oscillating signal at a node between the resistor and the second magnetic tunnel junction.
A method of operating a spin torque oscillator comprising a first magnetic reference layer having a fixed magnetization, a magnetic precession layer having a magnetization capable of precessing about an initial direction, and a first barrier layer interposed between the first magnetic reference layer and the magnetic precession layer, the first barrier being formed of an insulating material capable of inducing a negative differential resistance for the spin torque oscillator, the method comprising:
- applying a direct current (DC) bias to the spin torque oscillator to operate it in a negative differential resistance region;
- and
- extracting an oscillating signal output from the spin torque oscillator.
Dependencies are inferred from the claim text.