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arXiv 0810.0389cond-mat.mtrl-sci
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室温下铁磁薄膜磁各向异性的电压控制反转

Voltage controlled inversion of magnetic anisotropy in a ferromagnetic thin film at room temperature

M. Weiler, A. Brandlmaier, S. Gepraegs, M. Althammer, M. Opel, C. Bihler, H. Huebl, M. S. Brandt, R. Gross, S. T. B. Goennenwein

摘要:

利用电场控制磁性是磁学和磁电子学的一个重要方面。在这里,我们利用磁弹性耦合的铁磁/压电混合体实现在室温下的磁化方向的电压控制。样品由蒸发到压电致动器上的多晶镍薄膜组成。这些多功能的混合物的磁性能进行了研究,在室温下作为一个功能的电压控制的应力施加的致动器上的Ni膜。铁磁共振谱表明,在Ni膜平面中的磁易轴旋转90度时,改变施加到致动器的电压Vp的极性。换句话说,Ni膜的面内单轴磁各向异性可以通过施加适当的电压Vp而反转。使用SQUID磁强计,记录磁化矢量的演变作为Vp和外部磁场的函数。改变Vp允许在大约70度的范围内可逆地调节Ni膜平面中的磁化取向。所有的磁力测量数据都可以用铁磁共振实验确定的磁自由能来定量地理解。这些结果表明,在混合结构中的磁弹性耦合确实是一个可行的选择,以控制在技术相关的铁磁薄膜在室温下的磁化取向。

英文摘要:

The control of magnetic properties by means of an electric field is an important aspect in magnetism and magnetoelectronics. We here utilize magnetoelastic coupling in ferromagnetic/piezoelectric hybrids to realize a voltage control of magnetization orientation at room temperature. The samples consist of polycrystalline nickel thin films evaporated onto piezoelectric actuators. The magnetic properties of these multifunctional hybrids are investigated at room temperature as a function of the voltage controlled stress exerted by the actuator on the Ni film. Ferromagnetic resonance spectroscopy shows that the magnetic easy axis in the Ni film plane is rotated by 90 degree upon changing the polarity of the voltage Vp applied to the actuator. In other words, the in-plane uniaxial magnetic anisotropy of the Ni film can be inverted via the application of an appropriate voltage Vp. Using SQUID magnetometry, the evolution of the magnetization vector is recorded as a function of Vp and of the external magnetic field. Changing Vp allows to reversibly adjust the magnetization orientation in the Ni film plane within a range of approximately 70 degree. All magnetometry data can be quantitatively understood in terms of the magnetic free energy determined from the ferromagnetic resonance experiments. These results demonstrate that magnetoelastic coupling in hybrid structures indeed is a viable option to control magnetization orientation in technologically relevant ferromagnetic thin films at room temperature.

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