Regensburg 2016 – scientific programme

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MA: Fachverband Magnetismus

MA 48: Poster Session II

MA 48.33: Poster

Thursday, March 10, 2016, 15:00–18:00, Poster B1

towards ferromagnetic resonance in scanning tunneling microscopy using homodyne detection — •marie hervé, moritz peter, and wulf wulfhekel — Physikalisches Institut, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany

In this communication we report on the experimental development of a new technique to measure locally ferromagnetic resonance signals with a SP-STM. The concept of this experiment, inspired by the spin torque diode effect [1], is based on the homodyne detection of the resonance signal in the sample. A continuous radio-frequency (rf) voltage (up to 3 GHz) is mixed to the bias voltage of the STM. If there is a magnetisation precession under the STM tip, the tunneling conductance will be modulated at the resonance frequency. When the high frequency signal mixed to the tunneling junction reach the resonance frequency of the precession, the tunneling current is rectified. This rectified current, measurable by conventional STM transimpedance amplifier correspond to a ferromagnetic resonance signal in the sample.

[1] A. A. Tulapurkar, Y. Suzuki, A. Fukushima, H. Kubota, H. Maehara, K. Tsunekawa, D. D. Djayaprawira, N. Watanabe and S. Yuasa, Nature 438, 339 (2005)