Electrical control of Curie temperature in cobalt using an ionic liquid film

Abstract

Magnetic and electric properties of transition-metal-doped ZnO films Appl. Phys. Lett. 79, 988 (2001); 10.1063/1.1384478Effect of growth temperature on Curie temperature of magnetic ultrathin films Co/Cu (100) Temperature-dependent magnetism in transition metal films observed by magnetic force microscopy and classical magnetometry

Control of Magnetism in Dilute Magnetic Semiconductor (Ga,Mn)As Films by Surface Decoration of Molecules

“…For this reason, similar schemes were attempted on ultrathin ferromagnetic metal films at room temperature, despite persisting doubts on whether the tiny signal could be observed/exploited [23]. After the first breakthrough on the electric-field control of coercive field in FePd and FePt thin films by using ionic liquid to generate a giant interfacial electric-field [24], much progress has been achieved in recent years, such as the electrical control of magnetic anisotropy, coercive field, and even T C in Fe, CoFeB, and Co thin films [25][26][27][28][29][30][31][32]. More intriguing, electrical switching of FeCo and CoFeB ultrathin films in magnetic tunnel junctions (MTJs) has also been realized, laying the groundwork for their potential applications in MRAM [33][34][35][36][37][38].…”

Modulation of the magnetic domain size induced by an electric field

“…6,7,8,19 The mechanism of the EF effect on MA in 3d-transition metals was considered using the electron occupancy change at d-orbitals caused by a Fermi level E F shift and/or a change in the electronic structure near E F . 7,23,24 Not only the MA modulation but also a change in Curie temperature T C was reported in a metallic Pt/Co system 10,11 as well as in ferromagnetic semiconductors. 1,3 Using ab initio calculation, the T C change due to EF application to a Pt/Co system was suggested to be explained by the modulation of the Heisenberg exchange parameter.…”

Electric-field control of domain wall nucleation and pinning in a metallic ferromagnet

“…Despite the limited penetration depth of an E-field in metals, the charge induced at the metal/dielectric interface on the topmost atomic layers is sufficient to modify the surface magnetic anisotropy energy (MAE) by a non negligible amount in ultrathin ferromagnetic layers as suggested by electronic structure calculations [9][10][11] . This has a particular impact in systems where the different anisotropy contributions almost cancel each other out, resulting in a large relative variation of the total effective MAE when the surface contribution is modified with the voltage [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] . We have studied here a Pt/Co/AlOx sample where the surface MAE could be varied in two ways : charging the metal/dielectric interface and modifying its oxidation.…”