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Magnetic properties and spin reorientation of hexagonal HoFeO_3 thin films

机译：六角Hofeo_3薄膜的磁性和旋转重新定向

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摘要

We present structural, magnetic, and optical properties of hexagonal HoFeO3/Al2O3 thin films deposited by Magnetron Sputtering. The x-ray diffraction patterns of HoFeO3 thin films show the c-planes of a hexagonal structure. The magnetization data display an antiferromagnetic transition temperature, TN-120 +/- 5 K and the magnetization-field hysteresis loops were measured below 100 K, confirming a weak ferromagnetism arising from a spin canting of the Fe3+ moments. The magnetization data also show an anomaly around-40 K due to a spin-reorientation transition caused by the Ho3+-Fe3+ interactions. We observed comparable magnetization along the ab plane and c axis although the spin canting of Fe3+ sites has a preferential component along the c axis, suggesting that the Ho3+- Fe3+ interactions dominate in the low temperature magnetic structures of hexagonal-HoFeO3. The observed electronic excitations at similar to 2.29, 2.87, 3.82, 4.79, and 6.53 eV have been assigned to the Fe3+ d to d on-site as well as O 2p to Fe 3d, Ho 6s, and 5d charge-transfer excitations, respectively. The room temperature energy band gap of the hexagonal-HoFeO3 thin film was measured to be similar to 1.99 +/- 0.04 eV.
机译：我们呈现由磁控溅射沉积的六边形HofeO3 / Al2O3薄膜的结构，磁性和光学性质。 HofeO3薄膜的X射线衍射图案显示了六边形结构的C平面。磁化数据显示反铁磁化转变温度，TN-120 +/- 5K和磁化场滞后环测量在100k以下，确认来自Fe3 +时刻的旋转倾倒而产生的弱铁磁性。由于HO3 + -Fe3 +相互作用引起的旋转重新定向转变，磁化数据还显示出约40k的异常。我们观察到沿AB平面和C轴的可比较磁化，尽管Fe3 +位点的自旋倾倒具有沿C轴的优先组分，表明HO3 + -F3 +相互作用在六边形-HofeO3的低温磁性结构中占主导地位。观察到的电子激发类似于2.29,2.87,3.82,4.79和6.53eV，分别分配到FE3 + D至D到DAT，以及O 2P至FE 3D，HO 6S和5D电荷转移激励。测量六边形-HofeO3薄膜的室温能带隙以类似于1.99 +/- 0.04eV。

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