Magnetically tunable bipolar switching of the exchange-bias field in Co2TiO4

Magnetically tunable bipolar switching of the exchange-bias field in Co2TiO4
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Co2TiO4 中交换偏压场的磁可调双极切换

DOI:
10.1016/j.jmmm.2017.06.002
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发表时间:
2017-11
影响因子:
2.7
通讯作者:
Wang D. H.
Wang D. H.
中科院分区:
材料科学3区
文献类型:
--
作者:
Wei A.;Tao S.;Fang Y.;Han Z. D.;Qian B.;Jiang X. F.;Zhou H.;Tang R. J.;Wang D. H.

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已知在反铁磁和铁磁组分之间的界面处的耦合是交换偏倚效应的原因,其中外界刺激如温度,电场或磁场应该影响相关的现象学。在本文中,我们制备了多晶co2tio4,并研究了它的温度和场相关磁化,从中提取了与磁反转相关的不寻常的交换偏置效应。在低温下,随着冷却磁场的增加,交换偏置场可以从负向正连续交叉,表现出磁可调谐效应。该化合物交换偏置场的双极开关取决于Co2+和[Co3+Ti3+]磁矩之间的相对取向。
Coupling at the interfaces between antiferromagnetic and ferromagnetic constituents is known to be responsible for the exchange-bias effect, where external stimulus like temperature, electric or magnetic fields are supposed to influence the associated phenomenology. In this paper, we prepare the polycrystalline Co2TiO4and investigate its temperature- and field-dependent magnetization, from which an unusual exchange-bias effect associated with magnetic reversals is extracted. At low temperature, a continuous crossover from negative to positive exchange-bias fields can be obtained with increment of the cooling magnetic field, showing a magnetically tunable effect. The bipolar switching of exchange-bias field in this compound depends on the relative orientation between Co2+and [Co3+Ti3+] magnetic moments.
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