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Test of unified picture of spin-dependent transport in perpendicular (CPP) giant magnetoresistance and bulk alloys

J. Appl. Phys. 85, 4542 (1999); doi:10.1063/1.370402

Issue Date: 15 April 1999

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W. Park, R. Loloee, J. A. Caballero, W. P. Pratt, Jr., P. A. Schroeder, and J. Bass
Department of Physics and Astronomy, Center for Fundamental Materials Research, and NSF Center for Sensor Materials, Michigan State University, East Lansing, Michigan 48824-1116

A. Fert and C. Vouille
Unite Mixte de Recherche, CNRS-Thomson, Orsay, France
Measurements of current perpendicular (CPP) magnetoresistance (MR) on hybrid and exchange-biased spin valves allow determination of the layer anisotropy parameter beta for ferromagnetic alloys, thus allowing testing of whether this CPP beta is similar to values obtained from direct measurements on, and theoretical estimates for, dilute bulk ferromagnetic alloys. Of special interest are alloys where beta is expected to be negative. In this article, we derive a value of beta for a Ni97Cr3 alloy using such spin valves based upon permalloy. We confirm prior CPP-MR results that this beta is negative, but our inferred value, beta = –0.35 ± 0.1, is closer to bulk and theoretical estimates. Our data thus provide new support for a unified picture of beta in the CPP-MR and bulk alloys. We also derive a short spin-diffusion length in NiCr, lsf = 3 ± 1 nm. ©1999 American Institute of Physics.
Permalink: http://link.aip.org/link/?JAPIAU/85/4542/1
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KEYWORDS and PACS

Keywords
PACS
  • 75.70.Cn
    Magnetic properties and materials Magnetic films and multilayers Interfacial magnetic properties (multilayers, magnetic quantum wells, superlattices, magnetic heterostructures)
  • 75.70.Pa
    Magnetic properties and materials Magnetic films and multilayers Giant magnetoresistance
  • 72.15.Gd
    Electronic transport in condensed matter Electronic conduction in metals and alloys Galvanomagnetic and other magnetotransport effects
  • 75.50.Cc
    Magnetic properties and materials Studies of specific magnetic materials Other ferromagnetic metals and alloys
  • YEAR: 1999

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ISSN:
0021-8979 (print)   1089-7550 (online)
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REFERENCES (15)
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