Electric and Magnetic Tuning of Gilbert Damping Constant in LSMO/PMN-PT(011) Heterostructure

Avisek Das; Mrinalini Mrinalini; Takamasa Usami; Satya Prakash Pati; Tomoyasu Taniyama; Venkataiah Gorige

doi:10.1088/1361-648X/accc66

Electric and Magnetic Tuning of Gilbert Damping Constant in LSMO/PMN-PT(011) Heterostructure

J Phys Condens Matter. 2023 Apr 12. doi: 10.1088/1361-648X/accc66. Online ahead of print.

Authors

Avisek Das¹, Mrinalini Mrinalini¹, Takamasa Usami², Satya Prakash Pati³, Tomoyasu Taniyama⁴, Venkataiah Gorige⁵

Affiliations

¹ School of Physics, University of Hyderabad, Gachibowli, Hyderabad 500046, India, Hyderabad, Telangana, 500046, INDIA.
² Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan, Nagoya, Aichi, 464-8601, JAPAN.
³ Department of Physics, Nagoya University, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan, Nagoya, 464-8601, JAPAN.
⁴ Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8602, JAPAN.
⁵ School of Physics, University of Hyderabad, University of Hyderabad, Prof C R Rao Road, Gachibowli, Hyderabad, Telangana, 500046, INDIA.

PMID: 37044113
DOI: 10.1088/1361-648X/accc66

Abstract

Electric field control of magnetodynamics in magnetoelectric (ME) heterostructures hasbeen the subject of recent interest due to its fundamental complexity and promising applications inroom temperature devices. The present work focuses on the tuning of magnetodynamic parametersof epitaxially grown ferromagnetic (FM) La_0.7Sr_0.3MnO₃(LSMO) on a ferro(piezo)electric (FE)Pb(Mg_0.33Nb_0.67)O₃-PbTiO₃(PMN-PT) single crystal substrate. The uniaxial magnetic anisotropyof LSMO on PMN-PT confirms the ME coupling at the FM/FE heterointerface. The magnitude ofthe Gilbert damping constant (α) of this uniaxial LSMO film measured along the hard magnetic axisis significantly small compared to the easy axis. Furthermore, a marked decrease in the α values ofLSMO at positive and negative electrical remanence of PMN-PT is observed, which is interpretedin the framework of strain induced spin dependent electronic structure. The present results clearlyencourage the prospects of electric field controlled magnetodynamics, thereby realising the roomtemperature spin-wave based device applications with ultra-low power consumption.

Keywords: Density of states; Ferromagnetic resonance; Gilbert damping constant; LSMO/PMN-PT heterostructure; Magnetodynamics; Spin wave.