Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 34: Spin Dynamics and Transport: Magnonics
MA 34.6: Vortrag
Mittwoch, 22. März 2017, 10:45–11:00, HSZ 04
Frequency modulation of backward volume spin wave by electric current — •Nana Nishida1, Seo-Won Lee2, Seung-Jae Lee3, Kyung-Jin Lee2,3, Helmut Schultheiss1, and Koji Sekiguchi4,5 — 1Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2Department of Materials Science and Engineering, Korea University, Seoul, Korea — 3KU-KIST Graduated School of Converging Science and Technology, Korea University, Seoul, Korea — 4Department of Physics, Keio University, Yokohama, Japan — 5JST-PRESTO, Tokyo, Japan
In the field of magnonics, spin waves are envisioned as a new candidate for information transport and processing. Since spin waves propagate without any charge displacement and are free from Joule heating, they offer significant reduction of energy consumption in devices. The spin transfer torque (STT) effect originating from conduction electrons is a powerful method for modulating spin waves. Here, we investigated the current induced Doppler shift of backward volume spin waves.
We fabricated a NiFe stripe with a width of 2 µ m, which was magnetized in backward volume configuration. The antennas fabricated on top of the NiFe stripe were connected to a vector network analyzer for measuring the spin-wave spectra. We applied a dc current to the NiFe stripe. For a current density of 5×1010 A/m2 the spin-wave frequencies shifted +170 MHz compared to the spin-wave spectra without dc current. This frequency shift is 60 times larger than previous works reported for forward volume spin waves. Hence, we demonstrated giant frequency modulation of backward volume spin waves by a dc current.