Well-ordered L10-FePt nanoparticles synthesized by improved SiO2-nanoreactor method

被引：62

作者：

Tamada, Yoshinori ^{[1
]}

Yamamoto, Shinpei ^{[1
]}

Takano, Mikio ^{[1
]}

Nasu, Saburou ^{[1
]}

Ono, Teruo ^{[1
]}

机构：

[1] Kyoto Univ, Inst Chem Res, Kyoto 6110011, Japan

来源：

APPLIED PHYSICS LETTERS | 2007年 / 90卷 / 16期

关键词：

D O I：

10.1063/1.2728760

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

It was found that the well-ordered L1(0) structure is formed in the FePt nanoparticles synthesized by the improved "SiO2-nanoreactor" method, whereas the previously employed annealing condition has suffered from the presence of the unconverted fcc-FePt nanoparticles which are superparamagnetic at room temperature. The L1(0)-FePt nanoparticles prepared by this method showed a smooth hysteresis loop with no kink, and the room temperature coercivity reaches an extremely large value of 28 kOe, even though the particle size is 6.7 nm in diameter. The Mossbauer hyperfine parameters of the nanoparticles are very close to those of the bulk L1(0)-FePt alloy, indicating that they possess magnetic moments comparable to the bulk even at the particle surface. (C) 2007 American Institute of Physics.

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