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arXiv 1706.08488cond-mat.mtrl-sci
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绝缘铁磁钆铁石榴石薄膜的垂直磁各向异性

Perpendicular magnetic anisotropy in insulating ferrimagnetic gadolinium iron garnet thin films

H. Maier-Flaig, S. Geprägs, Z. Qiu, E. Saitoh, R. Gross, M. Weiler, H. Huebl, S. T. B. Goennenwein

摘要:

通过简单地改变样品温度,我们对钆铁石榴石(GdIG)薄膜的磁各向异性进行了实验控制。通过SQUID磁强计测量获得的磁滞回线明确地揭示了易磁化轴从面外到面内的变化取决于样品温度。此外,我们证实了这些发现,通过使用温度依赖的宽带铁磁共振光谱(FMR)。为了确定有效磁化,我们利用FMR光谱的固有优势,其允许确定独立于顺磁性衬底的磁各向异性,而磁力测定法确定来自膜和衬底的组合磁矩。这使我们能够定量评估的各向异性和平滑过渡,从平面到垂直磁各向异性。此外,我们还导出了GdIG薄膜的温度依赖性$g$因子和Gilbert阻尼。

英文摘要:

We present experimental control of the magnetic anisotropy in a gadolinium iron garnet (GdIG) thin film from in-plane to perpendicular anisotropy by simply changing the sample temperature. The magnetic hysteresis loops obtained by SQUID magnetometry measurements unambiguously reveal a change of the magnetically easy axis from out-of-plane to in-plane depending on the sample temperature. Additionally, we confirm these findings by the use of temperature dependent broadband ferromagnetic resonance spectroscopy (FMR). In order to determine the effective magnetization, we utilize the intrinsic advantage of FMR spectroscopy which allows to determine the magnetic anisotropy independent of the paramagnetic substrate, while magnetometry determines the combined magnetic moment from film and substrate. This enables us to quantitatively evaluate the anisotropy and the smooth transition from in-plane to perpendicular magnetic anisotropy. Furthermore, we derive the temperature dependent $g$-factor and the Gilbert damping of the GdIG thin film.

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