Das Avisek, Mrinalini Mrinalini, Usami Takamasa, Pati Satya Prakash, Taniyama Tomoyasu, Gorige Venkataiah
School of Physics, University of Hyderabad, Gachibowli, Hyderabad 500046, India, Hyderabad, Telangana, 500046, INDIA.
Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan, Nagoya, Aichi, 464-8601, JAPAN.
J Phys Condens Matter. 2023 Apr 12. doi: 10.1088/1361-648X/accc66.
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) LaSrMnO(LSMO) on a ferro(piezo)electric (FE) Pb(MgNb)O-PbTiO(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.
由于磁电（ME）异质结构中磁动力学的电场控制具有基本复杂性以及在室温器件中的应用前景，最近受到了关注。目前的工作重点是在铁（压电）电（FE）Pb（MgNb）O-PbTiO（PMN-PT）单晶衬底上对外延生长的铁磁（FM）LaSrMnO（LSMO）的磁动力学参数进行调谐。LSMO在PMN-PT上的单轴磁各向异性证实了FM/FE异质界面处的ME耦合。与易轴相比，沿硬磁轴测量的这种单轴LSMO薄膜的吉尔伯特阻尼常数（α）的大小明显较小。此外，观察到在PMN-PT的正、负电剩磁时LSMO的α值显著降低，这在应变诱导的自旋相关电子结构框架内得到了解释。目前的结果清楚地鼓舞了电场控制磁动力学的前景，从而实现基于室温自旋波的超低功耗器件应用。
