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Low noise dual free-layer magnetoresistive sensor with coupled resonance
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View: Figures


Image of FIG. 1.
FIG. 1.

Dual-magnetic-free-layer MR sensor structure.

Image of FIG. 2.
FIG. 2.

(a) Transfer curve for −1 to applied field. Resistance normalized to orthogonal state resistance calculated from . (b) FL time traces at AP (−1 kOe) state. (c) FL time traces at P state.

Image of FIG. 3.
FIG. 3.

(a) Normalized spectrum of sensor resistance fluctuation at 0 Oe. [(b) and (c)] Normalized spectrum of component of FL-1 and FL-2 at 0 Oe. (d) Magnetization states of the two FL at 0 Oe. (e) Sensor noise power (0–1 GHz) normalized to 0 Oe resistance vs transverse field. (f) noise power of FL-1 and FL-2 vs transverse field.

Image of FIG. 4.
FIG. 4.

(a) Transfer curves at 0–200 Oe interlayer coupling fields. (b) Sensor noise power along the transfer curves in (a). (c) SNR under the three coupling fields. (d) Sensor resistance noise spectrum under each coupling field at 0 Oe transverse field. [(e) and (f)] Corresponding noise spectra of FL-1 and FL-2 at 0 Oe transverse field.

Image of FIG. 5.
FIG. 5.

(a) Noise spectra of DFL sensor with (gray) and without (dark) edge slopes at 0 Oe field. [(b) and (c)] Corresponding FL noise spectra. (d) Magnetization state of DFL sensor with edge slope—5 nm wider for FL-2. (e) Transfer curves and (f) SNR for with/without edge slope cases.

Image of FIG. 6.
FIG. 6.

(a) Noise power (0 Oe, 0–1 GHz) vs signal (200 Oe) power for DFL and HB structures. (b) Corresponding SNR.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Low noise dual free-layer magnetoresistive sensor with coupled resonance