Configuration and temperature dependence of magnetic damping in spin valves

Journal Article · Thu Sep 15 00:00:00 EDT 2011 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3638055· OSTI ID:22036725

Joyeux, X; Devolder, T; Kim, Joo-Von; Eimer, S; Chappert, C ^[1]

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1. Institut d'Electronique Fondamentale, University Paris-Sud, 91405 Orsay (France)

Using vector-analyzer ferromagnetic resonance, we have studied the microwave susceptibility of a Py/Co/Cu/Co/MnIr spin valve over a large temperature range (5-450 K) and as a function of the magnetic configuration. An effective magnetization and Gilbert damping constant of 1.1 T and 0.021, respectively, are found for the permalloy free layer, with no discernible variation in temperature observed for either quantities. In contrast, the pinned layer magnetization is reduced by heating, and the exchange bias collapses near a temperature of 450 K. The ferromagnetic resonance linewidth of the free layer increases by 500 MHz when the layer magnetizations are aligned in antiparallel, which is attributed to a configuration-dependent contribution to the damping from spin pumping effects.

• OSTI ID: 22036725
• Journal Information: Journal of Applied Physics, Vol. 110, Issue 6; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
COBALT
COPPER
DAMPING
EXCHANGE INTERACTIONS
FERROMAGNETIC RESONANCE
INTERFACES
IRIDIUM ALLOYS
LAYERS
MAGNETIC SUSCEPTIBILITY
MAGNETIZATION
MANGANESE ALLOYS
MHZ RANGE
MICROWAVE RADIATION
PERMALLOY
PUMPING
SPIN
TEMPERATURE DEPENDENCE
VALVES