Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 61: Skyrmion Dynamics

MA 61.4: Vortrag

Freitag, 24. März 2017, 10:15–10:30, HSZ 401

Towards ferromagnetic resonance in scanning tunnelling microscopy using homodyne detection — •Marie Hervé, Moritz Peter, Timofey Balashov, and Wulf Wulfhekel — Physikalisches Institut, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany

We report on the experimental development of a technique combining ferromagnetic resonance (FMR) and spin-polarized STM. The concept of this technique, inspired by the spin torque diode effect [1], is based on the homodyne detection of the resonance signal. A continuous radio-frequency (rf) voltage is mixed to the bias voltage of the STM. If there is a magnetization precession under the STM tip, the tunneling conductance will be modulated at the resonance frequency. When the rf signal mixed to the tunneling junction hits the resonance frequency of the precession, the tunneling current is rectified. This rectified current can be detected by a conventional transimpedance amplifier. To test this method we investigated the skyrmionic spin structure Fe(0.4ML)/Ir(111) [2]. The experiments allowed to reveal a resonant signal at 615 MHz. This signal is interpreted as a FMR feature.

[2] 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) [4] S. Heinze, K. von Bergmann, M. Menzel, J. Brede, A. Kubetzka, R. Wiesendanger, G. Bihlmayer and S. Blügel, Nature Physic 7, 713 (2011)