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Title: Current-driven non-linear magnetodynamics in exchange-biased spin valves

Abstract

This work investigates the excitation of parametric resonance in exchange-biased spin valves (EBSVs). Using a mechanical point contact, high density dc and microwave currents were injected into the EBSV sample. Observing the reflected microwave power and the small rectification voltage that develops across the contact allows detecting the current-driven magnetodynamics not only in the bulk sample but originating exclusively from the small contact region. In addition to ferromagnetic resonance (FMR), parametric resonance at twice the natural FMR frequency was observed. In contrast to FMR, this non-linear resonance was excited only in the vicinity of the point contact where current densities are high. Power-dependent measurements displayed a typical threshold-like behavior of parametric resonance and a broadening of the instability region with increasing power. Parametric resonance showed a linear shift as a function of applied dc bias which is consistent with the field-like spin-transfer torque induced by current on magnetic moments in EBSV.

Authors:
; ;  [1]
  1. Physics Department, University of Texas at Austin, Austin, Texas 78712 (United States)
Publication Date:
OSTI Identifier:
22410013
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CURRENT DENSITY; DIRECT CURRENT; ELECTRIC CONTACTS; ELECTRIC POTENTIAL; EXCITATION; FERROMAGNETIC RESONANCE; MAGNETIC MOMENTS; MAGNETORESISTANCE; MICROWAVE RADIATION; NONLINEAR PROBLEMS; SPIN; TORQUE

Citation Formats

Seinige, Heidi, Wang, Cheng, and Tsoi, Maxim, E-mail: tsoi@physics.utexas.edu. Current-driven non-linear magnetodynamics in exchange-biased spin valves. United States: N. p., 2015. Web. doi:10.1063/1.4913643.
Seinige, Heidi, Wang, Cheng, & Tsoi, Maxim, E-mail: tsoi@physics.utexas.edu. Current-driven non-linear magnetodynamics in exchange-biased spin valves. United States. doi:10.1063/1.4913643.
Seinige, Heidi, Wang, Cheng, and Tsoi, Maxim, E-mail: tsoi@physics.utexas.edu. Thu . "Current-driven non-linear magnetodynamics in exchange-biased spin valves". United States. doi:10.1063/1.4913643.
@article{osti_22410013,
title = {Current-driven non-linear magnetodynamics in exchange-biased spin valves},
author = {Seinige, Heidi and Wang, Cheng and Tsoi, Maxim, E-mail: tsoi@physics.utexas.edu},
abstractNote = {This work investigates the excitation of parametric resonance in exchange-biased spin valves (EBSVs). Using a mechanical point contact, high density dc and microwave currents were injected into the EBSV sample. Observing the reflected microwave power and the small rectification voltage that develops across the contact allows detecting the current-driven magnetodynamics not only in the bulk sample but originating exclusively from the small contact region. In addition to ferromagnetic resonance (FMR), parametric resonance at twice the natural FMR frequency was observed. In contrast to FMR, this non-linear resonance was excited only in the vicinity of the point contact where current densities are high. Power-dependent measurements displayed a typical threshold-like behavior of parametric resonance and a broadening of the instability region with increasing power. Parametric resonance showed a linear shift as a function of applied dc bias which is consistent with the field-like spin-transfer torque induced by current on magnetic moments in EBSV.},
doi = {10.1063/1.4913643},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 17,
volume = 117,
place = {United States},
year = {2015},
month = {5}
}