论文标题
FMR驱动的自旋泵送电流及其性能通过自谐谐波近似的理论分析
Theoretical analysis of FMR-driven spin pumping current and its properties via Self-Consistent Harmonic Approximation
论文作者
论文摘要
我们应用了自洽的谐波近似（SCHA），结合了连贯的状态形式主义，以在铁电剂/正常金属连接处研究铁磁共振（FMR）。由于界面相互作用，FMR生成的自旋电流从磁性绝缘体注入正常金属，即所谓的自旋泵。通常，铁磁模型通过骨器代表或现象学理论描述。但是，在连贯的磁化状态下，SCHA是治疗FMR问题的更自然的选择。多年来，SCHA已成功申请在广泛的情况下研究铁和抗铁磁性。 SCHA形式主义的重点涉及采用二次模型，该模型通过温度依赖性的重生参数包括在内。因此，SCHA是确定磁有序相的特性的有效方法。使用SCHA，我们获得了FMR驱动的自旋泵的温度依赖性。此外，我们发现了自旋混合电导，从角动量注射到正常金属侧的额外阻尼以及磁敏感性。 SCHA结果与文献的结果非常共识。
We applied the Self-Consistent Harmonic Approximation (SCHA), combined with coherent states formalism, to study the ferromagnetic resonance (FMR) in a ferromagentic/normal metal junction. Due to the interface interaction, the FMR-generated spin current is injected from the magnetic insulator to the normal metal, the so-called spin pumping. Ordinarily, ferromagnetic models are described by bosonic representation or phenomenological theories; however, in a coherent magnetization state, the SCHA is the more natural choice to treat FMR problems. Over the years, the SCHA has successfully applied to investigate ferro and antiferromagnetism in a wide range of scenarios. The main point of the SCHA formalism involves the adoption of a quadratic model for which corrections are included through temperature-dependent renormalization parameters. Therefore, the SCHA is an efficient method for determining the properties of magnetically ordered phases. Using the SCHA, we obtained the temperature dependence of FMR-driven spin pumping. In addition, we found the spin-mix conductance, the additional damping from the angular momentum injection into the normal metal side, and the magnetic susceptibility. The SCHA outcomes are in remarkable agreement with the results of the literature.
