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Photocontrol of magnetization in Al-substituted Fe3O4 thin films

机译：Al取代Fe3O4薄膜中磁化的光控

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摘要

Thin films of (111)-oriented spinel ferrite Al0.5Fe2.5O4 have been prepared by a pulsed-laser deposition (PLD) technique on alpha-Al2O3 (0001) substrates. The films exhibit cluster-glass behaviours with a spin-freezing temperature, T-g, near or above room temperature. The magnetization was found to increase following light irradiaiton below T-g, which indicates the photoinduced melting of cluster-glass states. An analysis comparing the dynamic behaviour of magnetic response to light irradiation between zero-field-zooled (ZFC) states and field-cooled (FC) states a 10 K under various light intensities, 1, revealed that the direct photoexcitation of spins occurs when 1 <= 0.78 mW/mm(2), while the thermal heating effect following the light absorption of the samples also contributes to the enhancement of magnetization when 1 >= 1.22 mW/mm(2). The magnetization of the films could be controlled by light irradiation even at room temperature.This suggests the possibility of utilizing these films in the development of novel magneto-optical memory devices. (c) 2005 Elsevier Ltd. All rights reserved.
机译：已通过脉冲激光沉积（PLD）技术在alpha-Al2O3（0001）基板上制备了（111）取向的尖晶石铁氧体Al0.5Fe2.5O4薄膜。薄膜在接近或高于室温的温度下具有旋转冷冻温度T-g的团簇玻璃行为。发现在低于T-g的光辐照后，磁化强度增加，这表明光诱导了簇玻璃态的熔化。一项分析比较了在各种光强度下10 K的零场Zooled（ZFC）状态和场致冷（FC）状态之间对光辐射的磁响应的动态行为1，表明自旋的直接光激发发生在1 <= 0.78 mW / mm（2），而当样品的吸光度> 1> = 1.22 mW / mm（2）时，随着样品吸光而产生的热效应也有助于磁化强度的提高。即使在室温下，也可以通过光照射来控制薄膜的磁化强度，这表明在开发新型磁光存储器件中利用这些薄膜的可能性。 （c）2005 Elsevier Ltd.保留所有权利。

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