title: Voltage-induced ferromagnetic resonance in magnetic tunnel junctions.
abstract: 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.
authors.affiliation: Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhu
authors.forename: J A
authors.initials: JA
authors.lastname: Katine
authors.forename: Graham E
authors.initials: GE
authors.lastname: Rowlands
authors.forename: Yu-Jin
authors.initials: YJ
authors.lastname: Chen
authors.forename: Zheng
authors.initials: Z
authors.lastname: Duan
authors.forename: Juan G
authors.initials: JG
authors.lastname: Alzate
authors.forename: Pramey
authors.initials: P
authors.lastname: Upadhyaya
authors.forename: Juergen
authors.initials: J
authors.lastname: Langer
authors.forename: Pedram Khalili
authors.initials: PK
authors.lastname: Amiri
authors.forename: Kang L
authors.initials: KL
authors.lastname: Wang
authors.forename: Ilya N
authors.initials: IN
authors.lastname: Krivorotov