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Continuously graded anisotropy in single (Fe53Pt47)100-xCux films

Journal article
Authors C. L. Zha
Randy K. Dumas
Yeyu Fang
Valentina Bonanni
Josep Nogués
Johan Åkerman
Published in Applied Physics Letters
Volume 97
Issue 18
Pages 182504 (3 pages)
ISSN 0003-6951
Publication year 2010
Published at Department of Physics (GU)
Pages 182504 (3 pages)
Language en
Links link.aip.org/link/?APPLAB/97/182504...
Keywords spinntronik, magnetism
Subject categories Magnetism

Abstract

We report on continuously graded anisotropy. During deposition, a compositional gradient is achieved by varying the Cu concentration from Cu-rich (Fe53Pt47)70Cu30 to Cu-free Fe53Pt47. The anisotropy gradient is then realized after annealing using the composition dependence of the low-anisotropy (A1) to high-anisotropy (L10) ordering temperature. The critical role of the annealing temperature on the resultant anisotropy gradient is investigated. Magnetic measurements support the creation of an anisotropy gradient in properly annealed films which exhibit both a reduced coercivity and moderate thermal stability. These results demonstrate that an anisotropy gradient can be realized, and tailored, in single continuous films without the need for multilayers.

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