Electric-Field Control of Magnetization and Electronic Transport in Ferromagnetic/Ferroelectric Heterostructures
This book mainly focuses on the investigation of the electric-field control of magnetism and spin-dependent transportation based on a Co40Fe40B20(CoFeB)/Pb(Mg1/3Nb2/3)0.7Ti0.3O3(PMN-PT) multiferroic heterostructure. Methods of characterization and analysis of the multiferroic properties with in situ electric fields are induced to detect the direct magnetoelectric (ME) coupling. A switchable and non-volatile electric field control of magnetization in CoFeB/PMN-PT(001) structures is observed at room temperature, and the mechanism of direct coupling between the ferroelectric domain and ferromagnetic film due to the combined action of 109° ferroelastic domain switching in PMN-PT and the absence of magnetocrystalline anisotropy in CoFeB is demonstrated. Moreover, the electric-field control of giant magnetoresistance is achieved in a CoFeB-based spin valve deposited on top of (011) oriented PMN-PT, which offers an avenue for implementing electric-writing and magnetic-reading random access memory at room temperature. Readers will learn the basic properties of multiferroic materials, many useful techniques related to characterizing multiferroics and the interesting ME effect in CoFeB/PMN-PT structures, which is significant for applications.
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American Physical Society antiferromagnetic Appl applications atoms behavior BiFeO3 butterfly-like characterization coercive field CoFeB film CoFeB/PMN-PT compound multiferroic configuration control of magnetization Copyright 2012 coupling effect diffraction direction of magnetization domain structure easy axis electric-field control electron epitaxial exchange bias exhibits external electric field external magnetic field ferroelastic ferroelectric materials ferroelectric order ferroic FM/FE GMR effect heterostructures in-plane investigation kind kV/cm laser layer Lett loop-like M-E curve Macmillan Publishers Ltd magnetic domain magnetic field magnetic recording magnetic tunnel junctions magnetocrystalline anisotropy magnetoelectric effect magnetoresistance magnetron magnetron sputtering measurement method MRAM multiferroic heterostructures multiferroic structure out-of-plane permission from Macmillan permission from Ref phase Phys piezoelectric piezoresponse piezostrain PMN-PT substrate polarization reversal pulsed laser deposition random access memory Reprinted with permission resonance result rhombohedral room temperature rotation sample surface shown in Fig single crystal spin valve spintronic strain strain-mediated thin film tunnel junction vector voltage