Well-ordered L10-FePt nanoparticles synthesized by improved SiO2-nanoreactor method
Well-ordered L10-FePt nanoparticles synthesized by improved SiO2-nanoreactor method
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DOI：
10.1063/1.2728760
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发表时间：
2007-04-16
影响因子：
4
通讯作者：
Ono, Teruo
中科院分区：
文献类型：
--
作者：
Tamada, Yoshinori;Yamamoto, Shinpei;Ono, Teruo
研究发现，通过改进的“SiO2-纳米反应器”方法合成的FePt纳米颗粒中形成了有序的L1(0)结构，而之前采用的退火条件由于未转化的fcc-FePt纳米颗粒的存在而受到影响，这些纳米颗粒在室温下具有超顺磁性。通过该方法制备的L1(0)-FePt纳米粒子表现出平滑的磁滞回线，无扭结，并且即使粒径为6.7 nm，室温矫顽力也达到28 kOe的极高值。纳米颗粒的穆斯堡尔超精细参数与大块 L1(0)-FePt 合金的穆斯堡尔超精细参数非常接近，表明即使在颗粒表面，它们也具有与大块合金相当的磁矩。 (C) 2007 年美国物理研究所。
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.