講演情報
[8a-E208-2]Oersted-field control of a spin-wave signal in Bi-doped YIG detected by the inverse spin Hall effect
〇河野 竜平1,2、Kyongmo An5,2、Diane Gouere4、Abdelmadjid Anane4、Vladimir Naletov2、野村 光1、Gregoire de Loubens6、Jamal Ben Youssef3、Laurent Vila2、Olivier Klein2 (1.東北大SRIS、2.Spintec, グルノーブル大、3.Lab-STICC, ブルターニュ大、4.Albert Fert研究所, パリサクレー大、5.忠北大学、6.SPEC, パリサクレー大)
キーワード：
マグノニクス、スピン波、YIG
We show that a sub-milliampere dc current controls the amplitude of a spin-wave resonance detected by spin pumping and the inverse spin Hall effect (ISHE) in a 21-nm Bi1Y2Fe5O12 film with perpendicular anisotropy. The electrical current flows in a line just above the Pt detector to produce an Oersted field is below 1% of the applied field, whereas it strongly gates the detected signal. The resonance peak grows by up to ×2.5 when this field opposes the applied field and falls to about half for the opposite polarity. This control is independent of microwave power over one decade of drive, recovering resonance signals from below the noise without adding amplifiers or noise filter. Together with supporting micromagnetic simulations, our results establish an energy-efficient, current-gated means for the spin-pumping signal in an magnetic garnet with perpendicular anisostropy.