Modulation of spin dynamics via voltage control of spin-lattice coupling in multiferroics

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Advanced Functional Materials March 10 cover article

Modulation of spin dynamics via voltage control of spin-lattice coupling in multiferroics

Author Mingmin Zhu

M. Zhu, Z. Zhou, B. Peng, S. Zhao, Y. Zhang, G. Niu, W. Ren, Z-G Ye, Y. Liu, M. Liu

Modulation of spin dynamics via voltage control of spin-lattice coupling in multiferroics

Advanced Functional Materials, 27, 1605598 (2017)

Keywords: Spin-Lattice Coupling Effect, Spin Waves, LSMO, Multiferroics, Magnonics

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Abstract

Motivated by the most recent progresses in both magnonics (spin dynamics) and multiferroics fields, this work aims at magnonics manipulation by the magnetoelectric coupling effect. Here, voltage control of magnonics, particularly the surface spin waves, is achieved in La0.7Sr0.3MnO3/0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 multiferroic heterostructures. With the electron spin resonance method, a large 135 Oe shift of surface spin wave resonance (≈7 times greater than conventional voltage-induced ferromagnetic resonance shift of 20 Oe) is determined. A model of the spin-lattice coupling effect, i.e., varying exchange stiffness due to voltage-induced anisotropic lattice changes, has been established to explain experiment results with good agreement. Additionally, an “on” and “off” spin wave state switch near the critical angle upon applying a voltage is created. The modulation of spin dynamics by spin-lattice coupling effect provides a platform for realizing energy-efficient, tunable magnonics devices.