Lowering of the L10 ordering temperature of FePt nanoparticles by He+ ion irradiation

被引：62

作者：

Wiedwald, U.

Klimmer, A.

Kern, B.

Han, L.

Boyen, H. -G.

Ziemann, P.

Fauth, K.

机构：

[1] Univ Ulm, Inst Festkorperphys, D-89069 Ulm, Germany

[2] Max Planck Inst Met Res, D-70569 Stuttgart, Germany

来源：

APPLIED PHYSICS LETTERS | 2007年 / 90卷 / 06期

关键词：

D O I：

10.1063/1.2472177

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Arrays of FePt particles (diameter 7 nm) with mean interparticle distances of 60 nm are prepared by a micellar technique on Si substrates. The phase transition of these magnetic particles towards the chemically ordered L1(0) phase is tracked for 350 kV He+ ion irradiated samples and compared to a nonirradiated reference. Due to the large separation of the magnetically decoupled particles the array can be safely annealed without any agglomeration as usually observed for more densely packed colloidal FePt nanoparticles. The He+ ion exposure yields a significant reduction of the ordering temperature by more than 100 K. (c) 2007 American Institute of Physics.

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页数：3

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