Magnetic device and frequency analyzer

Details Magnetic device and frequency analyzer Magnetic device and frequency analyzer

2007-12-10

2010-10-05

Nguyen, Ha Tran T (Department: 2829)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Magnetic saturation

Reexamination Certificate

active

07808229

ABSTRACT:
A magnetic device and a frequency analyzer are provided as those industrially utilizing a resonance phenomenon of a direction of magnetization of a magnetoresistive element. Since polarities of an alternating current i vary with time, the direction of magnetization oscillates as affected by the magnitude and frequency of the alternating current. When the frequency fFof the direction of magnetization of a free layer in the magnetoresistive element coincides with the frequency f of the alternating current flowing in the magnetoresistive element, the oscillation of the direction of magnetization resonates to increase a voltage between output terminals. A magnetic yoke applies such a magnetic field as to cause resonance, to the free layer. A direct current is used as an electric current outputted from a current control circuit and, while this direct current is swept, voltages at respective specific resonance frequencies are detected by a monitor circuit.

REFERENCES:
patent: 6256863 (2001-07-01), Saito et al.
patent: 2006/0062075 (2006-03-01), Koga et al.
patent: 2006/0067008 (2006-03-01), Haratani
patent: 2008/0150643 (2008-06-01), Suzuki et al.
A.A. Tulapurkar et al.; “Spin-Torque diode effect in magnetic tunnel junctions”;Nature; Nov. 17, 2005; pp. 339-342.

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