Perpendicular spin-torque-driven magnetic oscillator

Details Perpendicular spin-torque-driven magnetic oscillator Perpendicular spin-torque-driven magnetic oscillator

2006-07-21

2009-11-10

Blouin, Mark (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

Reexamination Certificate

active

07616412

ABSTRACT:
A perpendicular spin-torque-driven magnetic oscillator is disclosed. According to various embodiments, the magnetic oscillator comprises a magnetic reference stack, a magnetic oscillating stack, and an interlayer between the reference stack and the oscillating stack such that the reference stack and the oscillating stack are exchange coupled. The reference stack may have sufficient perpendicular anisotropy such that it causes, via the spin momentum transfer effect, the spin polarization of the conducting electrons in the oscillating stack to produce a spin torque on the local magnetization of the oscillating layer. As such, the oscillating stack may produce a sustained gyromagnetic oscillation around the perpendicular axis of the oscillating stack when (i) the oscillating stack and the reference stack have opposite magnetizations and (ii) there is a direct current flowing in the magnetic oscillator from the oscillating stack to the reference stack. Also, the oscillating stack may produce a sustained gyromagnetic oscillation when (i) the oscillating stack and the reference stack are magnetized in the same direction and (ii) there is a direct current flowing in the magnetic oscillator from the reference stack to the oscillating stack.

REFERENCES:
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patent: 2006/0221507 (2006-10-01), Sato et al.
S. Kaka et al., “Mutual phase-locking of microwave spin torque nano-oscillators,” Nature, vol. 437, Sep. 2005, pp. 389-392.
A. Rebei et al., “Fluctuations of the magnetization in thin films due to conduction electrons,” Physical Review B, vol. 71, Issue 17.
M.A. Hoefer et al., “Theory of Magnetodynamics Induced by Spin Torque in Perpendicularly Magnetized Thin Films,” Physical Review Letters (PRL) 95, 267206 (2005).

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