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Graded Anisotropy FePtCu Films
KTH, School of Information and Communication Technology (ICT), Material Physics.
KTH, School of Information and Communication Technology (ICT), Material Physics, Material Physics, MF.
KTH, School of Information and Communication Technology (ICT), Material Physics.
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2011 (English)In: IEEE transactions on magnetics, ISSN 0018-9464, E-ISSN 1941-0069, Vol. 47, no 6, 1580-1586 p.Article in journal (Refereed) Published
Abstract [en]

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)(70)Cu-30 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 (L1(0)) 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 L1(0) ordering process is found to depend on the film thickness.

Place, publisher, year, edition, pages
2011. Vol. 47, no 6, 1580-1586 p.
Keyword [en]
FePtCu thin films, first-order reversal curve (FORC) measurements, graded anisotropy films, magnetic reversal mechanism
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-34665DOI: 10.1109/TMAG.2010.2102745ISI: 000291004800010ScopusID: 2-s2.0-79957788901OAI: diva2:424125
Swedish Research CouncilKnut and Alice Wallenberg Foundation
QC 20110617Available from: 2011-06-17 Created: 2011-06-13 Last updated: 2011-06-17Bibliographically approved

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Zha, ChaolinFang, YeyuBonanni, ValentinaNogués, JosepÅkerman, Johan
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