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First order reversal curve analysis of graded anisotropy FePtCu films

Journal article
Authors Valentina Bonanni
Yeyu Fang
Randy K. Dumas
C. L. Zha
Stefano Bonetti
Josep Nogués
Johan Åkerman
Published in Applied Physics Letters
Volume 97
Issue 20
Pages 202501, 3 pages
ISSN 0003-6951
Publication year 2010
Published at Department of Physics (GU)
Pages 202501, 3 pages
Language en
Links link.aip.org/link/?APL/97/202501
Keywords spinntronik, magnetism
Subject categories Magnetism

Abstract

The reversal mechanisms of graded anisotropy FePtCu films have been investigated by alternating gradient magnetometer (AGM) and magneto-optical Kerr effect (MOKE) measurements with first-order reversal curve (FORC) techniques. The AGM-FORC analysis, which clearly shows the presence of soft and hard components, is unable to resolve how these phases are distributed throughout the film thickness. MOKE-FORC measurements, which preferentially probe the surface of the film, reveal that the soft components are indeed located toward the top surface. Combining AGM-FORC with the inherent surface sensitivity of MOKE-FORC analysis allows for a comprehensive analysis of heterogeneous systems such as graded materials.

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