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Graded Anisotropy FePtCu Films

Journal article
Authors Randy K. Dumas
Chaolin Zha
Yeyu Fang
Valentina Bonanni
J. W. Lau
Josep Nogués
Johan Åkerman
Published in IEEE Transactions on Magnetics
Volume 47
Issue 6
Pages 1580
ISSN 0018-9464
Publication year 2011
Published at Department of Physics (GU)
Pages 1580
Language en
Keywords magnetism, spintronics, graded materials
Subject categories Magnetism


The fabrication and subsequent analysis of continuously graded anisotropy films are discussed. During deposition, a compositional gradient is first achieved by varying the Cu concentration from Cu-rich (Fe53Pt47)70Cu30 to Cu-free Fe53Pt47. The anisotropy gradient is then realized after thermal post-annealing, and by utilizing the strong composition dependence of the low-anisotropy (A1) to high-anisotropy (L10) ordering temperature. The magnetic properties are investigated by surface sensitive magneto-optical Kerr effect and alternating gradient magnetometer (AGM) measurements. AGM first-order reversal curve (FORC) measurements are employed in order to provide a detailed analysis of the reversal mechanisms, and therefore the induced anisotropy gradient. At low annealing temperatures, the FORC measurements clearly indicate the highly coupled reversal of soft and hard phases. However, significant interdiffusion results in virtually uniform films at elevated annealing temperatures. Additionally, the A1 to L10 ordering process is found to depend on the film thickness.

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