MBE-Grown Fe magnetic quantum dots in ZnS matrix

被引：11

作者：

Lok, S. K. ^{[1
]}

You, B. ^{[1
]}

Zhang, B. ^{[1
]}

Zhang, X. X. ^{[1
]}

Sou, I. K. ^{[1
]}

Wong, G. K. L. ^{[1
]}

机构：

[1] Hong Kong Univ Sci & Technol, Kowloon, Hong Kong, Peoples R China

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2007年 / 43卷 / 06期

关键词：

magnetic anisotropy; quantum dots; NANOPARTICLES;

D O I：

10.1109/TMAG.2007.893859

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A multilayer magnetic quantum dot sample containing 5 layers of Fe quantum dots (QDs) embedded in six layers of ZnS spacer was grown by molecular beam epitaxy (MBE). High-resolution transmission electron microscopy (HRTEM) observations reveal that the Fe QDs are single crystalline with spherical shape of diameters around 3 to 4 mn and area density of 1.5 x 10(12) cm(-2). Its zero-field cooled (ZFC) and field cooled (FC) curves measured at low field (100 Oe) show the magnetic relaxation effect with a blocking temperature around 26 K. The hysteresis loop measured at 5 K shows a coercivity of 83 Oe, confirming the slow relaxation process and coercivity enhancement attributed to the nanoparticle nature of the sample.

引用

页码：3127 / 3129

页数：3

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