Strain-induced enhancement of coercivity in amorphous TbFeCo films

Abstract

We report a strong size dependence of coercivity in amorphous ferrimagnetic TbFeCo films. The as-deposited film exhibited a low saturation magnetization (Ms=100 emu/cc) and a high perpendicular anisotropy (Ku=10^6 erg/cc). Hall-bar devices were fabricated for characterizing the magneto-transport behaviors. A significant increase in coercivity (up to 300 %) was observed at room temperature as the width of Hall bar was reduced. The large coercivity enhancement was attributed to the relaxation of film stress. The effect of strain and dimensionality on the coercivity in TbFeCo makes it attractive for tunable coercivity and the magnetization reversal in future nanoscale devices.Comment: 17 pages, 3 figure

Interface enhanced magnetic anisotropy in Pt/EuO1−x films

“…There are other possibilities for the enhancement of the anisotropy at the Pt/EuO interface. One is due to the effect of strain at the interfaces 39 . This is an unlikely scenario.…”

Exchange bias and bistable magneto-resistance states in amorphous TbFeCo thin films

“…As shown in Figure 2, the Curie temperature (T C ) of the system is greater than 375 K. M S is expected to reach a minimum at T comp , which is near 250 K. To further exploit the EB effect, the magneto-transport behaviors were characterized on the aTbFeCo Hall bar devices. 23 Theoretically, the anomalous Hall effect (AHE) can be expressed as ∝ + , where R Tb and R FeCo are AHE coefficients, and M Tb and M FeCo are magnetizations. 37 It is known that in amorphous FM materials, R Tb is positive, while R FeCo is negative.…”

Spin Hall switching of the magnetization in Ta/TbFeCo structures with bulk perpendicular anisotropy

“…1(a) because of the incoherent switching in unpatterned film. 30 Once the current is increased to 8 mA, the coercivity reduces dramatically to 50 Oe, and the amplitude of The influence of the SHE on the magnetization can also be studied by sweeping the current in the presence of various in-plane fields along the y direction, as seen in Fig. 2(b).…”