自旋转移力矩 - 铁磁共振 （spin transfer torque induced ferromagnetic resonance，ST-FMR）是自旋电子学领域中的一种测试 自旋轨道力矩 （spin–orbit torques，SOT）效率的手段。 SOT efficiency是描述电荷电流-自旋流转换的效率（the charge-to-spin interconversion efficiency (SOT efficiency) ）。 而ST-FMR顾名思义，是由指由于自旋力矩而诱导产生的铁磁共振现象。

Ferromagnetic Resonance (FMR) is a powerful technique for studying the dynamic magnetic properties of materials. By applying a microwave field, FMR excites the precession of magnetization in a material, allowing the extraction of key magnetic parameters such as the saturation magnetization and damping constant.

Ferromagnetic resonance, or FMR, is coupling between an electromagnetic wave and the magnetization of a medium through which it passes. This coupling induces a significant loss of power of the wave. The power is absorbed by the precessing magnetization (Larmor precession) of the material and lost as heat.

2017年1月23日 · Spin-Torque Ferromagnetic Resonance (STFMR or sometimes ST-FMR) is a divine and wonderful technique for extracting the strength of in-plane and out-of-plane torques exerted from some layer onto a magnetic layer. It’s utility and broad use comes largely from the fact that it is a resonance phenomenon: the resulting signal is Lorentzian in nature.

Input Data: FMR Spectrum as a function of the applied magnetic field, microwave frequency and temperature. Output Data: Resonance field and linewidth (full width at half maximum with 95% confidence intervals). Fitting Model: Derivative of Lorentzian with real + imaginary parts.

The heart of a broadband FMR spectroscopy measurement setup, shown in Figure 2(a), is the coplanar waveguide (CPW). The role of the CPW is to efficiently transmit a microwave signal from a radio frequency (RF) source over a broad range of frequencies.

2021年2月19日 · Schematic diagram of a field-swept broadband coplanar waveguide based FMR setup. The absorption at resonance is detected in the transmitted power using lock-in detection based on field modulation or microwave frequency modulation (not shown).

2013年7月31日 · FMR spectrometer is a tool to record electromagnetic (EM) wave absorbed by sample of interest under the influence of external DC or Quasi DC magnetic field. Simply speaking, the spectrometer should consist of at least an EM wave excitation source, detector, and transmission line which bridges sample and EM source.

2020年7月1日 · Spin-torque ferromagnetic resonance (ST-FMR) is a powerful tool to evaluate spin-torque efficiency (ξ FMR), the efficiency of current-induced torque in metallic bilayers consisting of ferromagnetic and nonmagnetic materials.

Our broadband FMR setup in this study utilizes a coplanar waveguide [30] that enabled to measure FMR spectra up to 67 GHz. Field-swept spectra were fitted to accurately extract both the...