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Spin-transfer effects in spin-valves for CPP-GMR heads: A static and dynamic investigation

Abstract : This study was the first to analyze spin-transfer effects in complex spin-valves developed for CPP-GMR heads, containing exchanged biased synthetic antiferromagnetic layers, and laminated reference and free layers. As the currents used in such devices are of the same order of magnitude as the currents at which spin-torque effects are observed, these phenomena can generate parasitic noise and influence the functioning of the heads.
Spin-transfer was investigated in these multilayers through static and dynamic measurements. The influence of the laminating material on the CPP-GMR and the switching currents was analyzed as well. While the static phase diagrams can be understood based on macrospin modeling, full micromagnetic simulations are required to interpret the microwave spectra. For the first time, very coherent precession states excited by the current in the pinned layer were unequivocally demonstrated, suggesting a new possible structure for microwave oscillators.
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Contributor : Alina Deac <>
Submitted on : Saturday, June 10, 2006 - 8:52:13 AM
Last modification on : Wednesday, November 4, 2020 - 2:48:52 PM
Long-term archiving on: : Monday, April 5, 2010 - 9:22:20 PM


  • HAL Id : tel-00079240, version 1



Alina Deac. Spin-transfer effects in spin-valves for CPP-GMR heads: A static and dynamic investigation. Condensed Matter [cond-mat]. Université Joseph-Fourier - Grenoble I, 2005. English. ⟨tel-00079240⟩



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