Tunable interface anisotropy in a Pt/Co_1−xFe_x/Pt multilayer

Abstract

Interfacial magnetic anisotropy in a Pt/Co1−xFex/Pt multilayer is tuned by doping iron atoms into the cobalt layer. The perpendicular magnetic anisotropy and out-of-plane coercivity are found to decrease with increasing x. For a specific x, the out-of-plane coercivity acquires a maximal value as a function of the thickness of the CoFe layer. At low temperature, the coercivity is enhanced. Small coercivity but reasonably large perpendicular magnetic anisotropy can be obtained by controlling the x and CoFe layer thickness.

Electric-field control of perpendicular magnetic anisotropy by resistive switching via electrochemical metallization

“…Here, H eff = 2K eff /M s and it is approximately equal to the saturation magnetic field of the in-plane M-H loop. [32,33] Therefore, these results confirm that the variation of H C for the out-of-plane 067505-4 M-H loops can reflect the modulation of PMA in the present work. Note that only 0.092-nm-thick Ag layer can reduce the H C by about 40%.…”

“…Similar results could be also observed in other devices, although the H C value at OS and its relative change are different, as shown in Figs. 3(c In the Pt/Co/Pt multilayer film, the perpendicular magnetization reversal mechanism is dominated by the pinned domain wall motion [32][33][34][35] and the domain wall energy γ = 4 √ AK eff 067505-3…”

Field-Free Spin–Orbit Torque-Induced Magnetization Switching in the IrMn/CoTb Bilayers with a Spontaneous In-Plane Exchange Bias

“…As shown in Figure S6, Supporting Information, H c nearly obeys a proportional function of 1/cos(θ H ), indicating that the magnetization switching mechanism conforms to the pinning and motion of the domain wall model. 48,49 In other words, the magnetization reversal process is initiated by nucleation of reversed domains and then accomplished by pinned domain wall motion, in good agreement with the PMOKE results. To know whether thermal activation plays a role in the current-induced magnetization reversal process, the critical switching current as a function of pulse duration was also investigated.…”

Effect of magnetic properties of soft magnetic phase on the energy product of an exchange-spring magnet

“…However, the typical energy product achieved in an exchange-spring magnet by experimental efforts in the past 20 years is 160 kJ/m 3 , which is far below the expected value of 1 MJ/m 3 . [4][5][6][7] The huge gap may be due to the random easy axis orientation of hard phase nanocrystallines and non-uniform microstructures in experimental samples, whereas the easy axis is perfectly and fully aligned and the microstructure is uniform in the theoretical model. However, besides the easy axis orientation degrees of hard phase nanocrystallines and the uniformity of the microstructure, there are still some other considerations to take into account to optimize the energy product for an exchangespring magnet.…”