Tunable ferromagnetic resonance peak in tunneling magnetoresistive sensor structures

Nazarov, Alexey V.; Cho, Hae Seok; Nowak, Janusz; Stokes, Scott; Tabat, Ned
December 2002
Applied Physics Letters;12/9/2002, Vol. 81 Issue 24, p4559
Academic Journal
Noise properties of submicron scale tunneling magnetoresistive (TMR) sensors were investigated at frequencies up to 3 GHz. Noise spectral density was measured as a function of frequency, applied field, and bias current. Noise spectral density versus frequency dependence exhibits a pronounced peak, tunable over a wide frequency range. This peak appears to originate from current-driven precession of magnetization. The peak center frequency can be as low as 200 MHz and has a strong dependence on applied field and bias current. The damping constant a of the main precession mode in the TMR sensor free layer was found to be in the range of 0.05-0.18. It is shown that the magnetic state of a magnetoresistive sensor depends on the bias current and may be characterized by noise properties. The magnetoresistive element can operate as a source of high-frequency radiation with 1 nW emitting power from a 0.1 µm² junction and signal to noise ratio of 10 dB.


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