Colossal magnetoresistance in spinel type Zn1-xNixFe2O4
Colossal magnetoresistance in spinel type Zn1-xNixFe2O4
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DOI：
10.1063/1.1762707
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发表时间：
2004-07-15
影响因子：
3.2
通讯作者：
Tabata, H
中科院分区：
文献类型：
--
作者：
Hossain, AKMA;Seki, M;Tabata, H
尖晶石型铁氧体在实际应用中有着广泛的应用。报道了锌镍铁氧体的一种引人注目的性质，为其应用指明了方向。在尖晶石结构的ZnFe2O4和Ni取代的Zn1-xNixFe2O4铁氧体中观察到较大的负磁阻效应。这些材料在室温下是铁磁性或顺磁性的，在低温下发现了自旋（团簇）玻璃化转变。磁电阻是抛物线或线性相对于应用领域高达9 T取决于成分和温度。结果表明，在x=0.2时，随着Ni含量的增加，Zn1-xNixFe2O4的磁阻效应逐渐增大，当x=1.0时，即NiFe2O4的磁阻效应逐渐减小，直至可以忽略。这种磁阻效应可以用自旋相关散射和ni取代Zn-Ni铁氧体的Yafet-Kittel角来解释。(C) 2004年美国物理研究所。
Spinel-type ferrites are widely used in practical applications. A fascinating property of Zn-Ni ferrites which reveals a direction for application is reported. A large negative magnetoresistance effect has been observed in ZnFe2O4 and Ni substituted Zn1-xNixFe2O4 ferrites of spinel structure. These materials are either ferrimagnetic or paramagnetic at room temperature and a spin (cluster) glass transition was found for some compositions at low temperatures. The magnetoresistance is either parabolic or linear with respect to applied field up to 9 T depending on the compositions and temperatures. It was found that the magnetoresistance effect increases as the Ni content increases in Zn1-xNixFe2O4 up to x=0.2 and then again decreases and finally become negligible for x=1.0, i.e., NiFe2O4. This magnetoresistance effect can be explained with the help of spin-dependent scattering and the Yafet-Kittel angle of the Ni-substituted Zn-Ni ferrites. (C) 2004 American Institute of Physics.