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首页> 外文期刊>Science and Technology of Advanced Materials >Thickness dependence of magnetic state of Fe thin films grown on Al_2O_3(0001) substrates with an inclined angle
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Thickness dependence of magnetic state of Fe thin films grown on Al_2O_3(0001) substrates with an inclined angle

机译：倾斜角度在Al_2O_3（0001）衬底上生长的Fe薄膜的磁性态的厚度依赖性

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摘要

We have investigated the magnetic state of Fe thin films grown on Al_2O_3(0001) inclined substrates at the Fe thickness range of 5-25 ML (monolayer) (1.0-5.0 nm). For 5 ML Fe films, the magnetic state is superparamagnetic state and the effect of inclination of substrate is negligible. The magnetic state of 10 ML Fe films is in the coexistence of superparamagnetic state and ferromagnetic state, and the effect of inclination of substrate appears but is still a little. In the ferromagnetic region, above Fe thickness of 15 ML, the magnetic easy axis is influenced by the inclination of substrate. Fe thin films grown on the flat substrate have no preferred direction of magnetization in the film plane because of the three equivalent variants of the epitaxial Fe(110) on Al_2O_3(0001). On the other hand, Fe thin films grown on the inclined substrate have a uniaxial magnetic anisotropy, in which the magnetic easy axis is parallel to the step edge. The strength of uniaxial magnetic anisotropy decreases with increasing Fe thickness. This uniaxial magnetic anisotropy might be derived from the effective demagnetization field due to the magnetic charge distribution at the corrugated surface caused by the steps.
机译：我们已经研究了在厚度为5-25 ML（单层）（1.0-5.0 nm）的Al_2O_3（0001）倾斜衬底上生长的Fe薄膜的磁态。对于5 ML Fe薄膜，其磁态为超顺磁态，并且基板倾斜的影响可忽略不计。 10 ML Fe薄膜的磁态处于超顺磁态和铁磁态并存，并且出现了衬底倾斜的影响，但影响很小。在铁磁区域中，Fe厚度大于15 ML时，易磁化轴会受到基材倾斜的影响。由于在Al_2O_3（0001）上外延Fe（110）的三个等效变体，在平坦基板上生长的Fe薄膜在膜平面中没有优选的磁化方向。另一方面，在倾斜衬底上生长的Fe薄膜具有单轴磁各向异性，其中磁易轴平行于台阶边缘。单轴磁各向异性的强度随着铁厚度的增加而降低。由于台阶引起的波纹表面上的电荷分布，该单轴磁各向异性可能源自有效退磁场。

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