Bi-quadratic interlayer exchange coupling in Co{sub 2}MnSi/Ag/Co{sub 2}MnSi pseudo spin-valve

Journal Article · Thu Dec 15 00:00:00 EST 2011 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3671634· OSTI ID:22036791

Goripati, Hari S; Hono, K ^[1]; Hayashi, Masamitsu; Furubayashi, T; Taniguchi, T; Sukegawa, H; Takahashi, Y K ^[1]

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1. National Institute for Materials Science, Tsukuba 305-0047 (Japan)

Bi-quadratic interlayer exchange coupling is found below 100 K in a Co{sub 2}MnSi/Ag/Co{sub 2}MnSi current-perpendicular-to-plane pseudo spin valves. The bi-quadratic coupling constant J{sub 2} was estimated to be {approx}-0.30 erg/cm{sup 2} at 5 K and the strong temperature dependence of the coupling strength points its likely origin to the ''loose spin'' model. Application of current of {approx}2 x 10{sup 7} A/cm{sup 2} below 100 K leads to an increase in the magnetoresistance (MR), indicating current induced antiparallel alignment of the two magnetic layers. These results strongly suggest that the presence of the bi-quadratic interlayer exchange coupling causes the reduction of the magnetoresistance at low temperature and illustrates the importance of understanding the influence of interlayer exchange coupling on magnetization configuration in magnetic nanostructures.

• OSTI ID: 22036791
• Journal Information: Journal of Applied Physics, Vol. 110, Issue 12; 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
77 NANOSCIENCE AND NANOTECHNOLOGY
COBALT ALLOYS
COUPLING
COUPLING CONSTANTS
ELECTRONS
EXCHANGE INTERACTIONS
INTERFACES
LAYERS
MAGNETIZATION
MAGNETORESISTANCE
MANGANESE ALLOYS
NANOSTRUCTURES
SILICON ALLOYS
SILVER
SPIN
TEMPERATURE DEPENDENCE
TUNNEL EFFECT
VALVES