Structural and magnetic properties of L10-FePt nanoparticles aligned by external magnetic field

被引：24
作者：
Tamada, Yoshinori [1 ]
Yamamoto, Shinpei [2 ]
Nasu, Saburo [1 ]
Ono, Teruo [1 ]
机构：
[1] Kyoto Univ, Inst Chem Res, Uji 6110011, Japan
[2] Kyoto Univ, Inst Integrated Cell Mat Sci, Kyoto 6068501, Japan
来源：
PHYSICAL REVIEW B | 2008年 / 78卷 / 21期
基金：
日本学术振兴会;
关键词：
composite materials; hyperfine interactions; iron alloys; magnetic field effects; magnetisation; Mossbauer effect; nanoparticles; platinum alloys; polymerisation; polymers; X-ray diffraction;
D O I：
10.1103/PhysRevB.78.214428
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We investigated structural and magnetic properties of the easy-axis aligned L1(0)-FePt nanoparticles by the combined use of x-ray diffraction (XRD), magnetization, and Fe-57 Mossbauer measurements. The L1(0)-FePt nanoparticles were fixed in a polystyrene matrix by performing free radical polymerization of styrene under an aligning external magnetic field. Mossbauer spectrum of the L1(0)-FePt nanoparticles/polystyrene composite showed tremendous decrease in the second and fifth absorption lines under the condition that the incident gamma ray was parallel to the aligning field. This result indicates that the easy axes of the L1(0)-FePt nanoparticles in the composite have a strong preferred orientation with a finite distribution. We estimated the distribution of easy-axis orientation by using the Mossbauer hyperfine parameters, which is in good agreement with that determined by the XRD rocking curve.
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页数：8
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