Antidot patterned single and bilayer thin films based on ferrimagnetic Tb–Co alloy with perpendicular magnetic anisotropy

Abstract

Hysteresis properties and magnetization reversal in TbCo(30 nm) and FeNi(10 nm)/TbCo(30 nm) films with nanoscale antidot lattices are investigated to test the effect of nanoholes on the perpendicular anisotropy in the TbCo layer and the induced exchange bias in the FeNi layer. The antidots are introduced by depositing the films on top of hexagonally ordered porous anodic alumina substrates with pore diameter and interpore distance fixed to 75 nm and 105 nm, respectively. The analysis of combined vibrating sample magnetometry, Kerr microscopy and magnetic force microscopy imaging measurements has allowed us to link macroscopic and local magnetization reversal processes. For magnetically hard TbCo films, we demonstrate the tunability of magnetic anisotropy and coercive field (i.e., it increases from 0.2 T for the continuous film to 0.5 T for the antidot film). For the antidot FeNi/TbCo film, magnetization of FeNi is confirmed to be in plane. Although an exchange bias has been locally detected in the FeNi layer, the integrated hysteresis loop has increased coercivity and zero shift along the field axis due to the significantly decreased magnetic anisotropy of TbCo layer.

Influence of nanoholes array geometrical parameters on magnetic properties of Dy–Fe antidot thin films

“…Magnetic studies of amorphous REx-Fe(100-x) thin films indicate that, for the heavier rare-earth metals, these films show a ferromagnetic behaviour [24,27]. Recently, RE-TM nanostructures based on antidots have shown a strong potential for energy-assisted recording on nanometre-scale magnetic media, magneto-optic perpendicular recording patterned media based on template-assisted deposition techniques and ultrafast spintronic technology [8,[28][29][30] In this work, we pay special attention to the basic magnetic properties such as the magnetic anisotropy, Curie temperature, effective magnetic anisotropy energy, remanence and coercivity angular dependence, of Dy-Fe alloy antidot arrays by studying the effect of the geometrical parameters as they are, shape and size of nanohole, holes spatial ordering and antidot film thickness, on their magnetic properties. In addition, the influence of hexagonal ordering symmetry of nanoholes arrangement on the magnetothermal behaviour as compared to the continuous thin film samples has been investigated.…”

“…Magnetic studies of amorphous RE x −Fe (100−x) thin films indicate that, for the heavier rare-earth metals, these films show a ferromagnetic behavior [24,27]. Recently, RE-TM nanostructures based on antidots have shown a strong potential for energy-assisted recording on nanometer-scale magnetic media, magneto-optic perpendicular recording patterned media based on template-assisted deposition techniques and ultrafast spintronic technology [8,[28][29][30].…”

Influence of the pore diameter in Cu/Co/Cu antidots: A XANES study

“…This synthesis procedure is based on the two-step-anodization method combined with an additional atomic layer deposition step [21]. as scanning electron microscopy [12,19,20,[23][24][25][26][27][28][29][30][31][32][33][34][35][36][37], atomic force microscopy [20,32,[38][39][40], x-ray diffraction [29,30], and…”