Indra Pardede, Tomosato Kanagawa, Nurul Ikhsan, Itsuki Murata, Daiki Yoshikawa, Masao Obata, Tatsuki Oda
Electric field (EF) control on magnetic anisotropy energy (MAE) in the system which contains Fe/MgO interface with Cr underlayer was performed by means of first-principles electronic structure calculations. An opposite sign in EF coefficient (γ) was observed by introducing Fe/Cr intermixing. This intermixing leads to a substantial rearrangement in the electronic structure due to proximity effects of Fe and Cr. The origin of such an opposite sign in γ was discussed along with the modulation of occupied and unoccupied d-band near the Fermi level. By introducing a strain effect, the enhancements of MAE and γ were achieved with the maximum absolute values, 2.43 mJ/m2 and 170 fJ/Vm, respectively. The present result provides a new possible degree of freedom for the EF control in MAE as the underlayer configuration. © 1965-2012 IEEE.
Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, 920-1192, Japan; Department of Physics, Institut Teknologi Sumatera, Lampung, 35365, Indonesia; School of Computing, Telkom University, Bandung, 40257, Indonesia; Institute of Science and Engineering, Kanazawa University, Kanazawa, 920-1192, Japan