Voltage-Induced Ferromagnetic Resonance in Magnetic Tunnel Junctions

Autor:	Zhu, Jian, Katine, J. A., Rowlands, Graham E., Chen, Yu-Jin, Duan, Zheng, Alzate, Juan G., Upadhyaya, Pramey, Langer, Juergen, Amiri, Pedram Khalili, Wang, Kang L., Krivorotov, Ilya N.
Rok vydání:	2012
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics
Zdroj:	Phys. Rev. Lett. 108, 197203 (2012)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.108.197203
Popis:	We demonstrate excitation of ferromagnetic resonance in CoFeB/MgO/CoFeB magnetic tunnel junctions (MTJs) by the combined action of voltage-controlled magnetic anisotropy (VCMA) and spin transfer torque (ST). Our measurements reveal that GHz-frequency VCMA torque and ST in low-resistance MTJs have similar magnitudes, and thus that both torques are equally important for understanding high-frequency voltage-driven magnetization dynamics in MTJs. As an example, we show that VCMA can increase the sensitivity of an MTJ-based microwave signal detector to the sensitivity level of semiconductor Schottky diodes. Comment: 5 pages; supplementary material added
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1205.2835 Zobrazit plný text záznamu View this record from Arxiv