A Study of the Origin of Weak Ferromagnetism in Zn1-xCoxO

被引：2
作者：
Yuldashev, S. H. U. [1 ]
Jeon, H. C. [1 ]
Kwon, Y. H. [1 ]
Lee, S. J. [1 ]
Kang, T. W. [1 ]
Igamberdiev, Kh. T. [1 ]
机构：
[1] Dongguk Univ, Quantum Funct Semicond Res Ctr, Seoul 100715, South Korea
来源：
JOM | 2014年 / 66卷 / 01期
基金：
新加坡国家研究基金会;
关键词：
TRANSITION;
D O I：
10.1007/s11837-013-0789-7
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
To study the origin of ferromagnetism in Zn1-x Co (x) O thin films, its thermal diffusivity, in addition to its magnetization measurements, were analyzed. Thin films of Zn1-x Co (x) O (x = 0.03) were deposited on Si (100) substrates through ultrasonic spray pyrolysis. Magnetization M(B) measurements at low temperature showed a hysteresis loop that indicated the existence of ferromagnetic ordering in Zn0.97Co0.03O. However, the magnetic moment per Co ion was much lower than expected. A comparison of M(T) measured at zero-field-cooled and field-cooled conditions showed a superparamagnetic-like behavior, with a blocking temperature of about 130 K. Temperature dependence on the thermal diffusivity of Zn0.97Co0.03O showed a pronounced lambda-shaped minimum at 130 K, which indicated the existence of a second-order phase transition at this temperature. The weak ferromagnetism in the Zn0.97Co0.03O with the Curie temperature of 130 K was ascribed to the uncompensated magnetic moment at the surface of CoO nanoclusters.
引用
收藏
页码：78 / 81
页数：4
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