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Comparison of Sensitivity and Low-Frequency Noise Contributions in Giant-Magnetoresistive and Tunneling-Magnetoresistive Spin-Valve Sensors with a Vortex-State Free Layer

2018; American Physical Society; Volume: 10; Issue: 5 Linguagem: Inglês

10.1103/physrevapplied.10.054056

2331-7043

Herbert Weitensfelder, Hubert Brueckl, Armin Satz, K. Pruegl, Juergen Zimmer, Sebastian Luber, Wolfgang Raberg, Claas Abert, Florian Bruckner, Anton Bachleitner-Hofmann, Roman Windl, Dieter Suess,

Magnetic and transport properties of perovskites and related materials

Magnetoresistive spin valve sensors based on the giant- (GMR) and tunnelling- (TMR) magnetoresisitve effect with a flux-closed vortex state free layer design are compared by means of sensitivity and low frequency noise. The vortex state free layer enables high saturation fields with negligible hysteresis, making it attractive for applications with a high dynamic range. The measured GMR devices comprise lower pink noise and better linearity in resistance but are less sensitive to external magnetic fields than TMR sensors. The results show a comparable detectivity at low frequencies and a better performance of the TMR minimum detectable field at frequencies in the white noise limit.