Influence of substrate on the magnetic properties of Ni and permalloy sub-micrometric patterned stripes

Abstract

The magnetic properties of sub-micrometric magnetic structures of Ni and permalloy (Ni80Fe20) patterned stripes are studied as functions of temperature. The samples are produced by combining an interferometric lithographic technique with sputtering. At room temperature, ferromagnetic resonance and hysteresis data indicate the existence of an in-plane uniaxial anisotropy in both samples. The NiFe sample has an easy axis along the stripes direction in the entire studied temperature range (2 < T < 300 K). On the other hand, an interesting change in the easy magnetization direction is observed in Ni samples, from parallel to perpendicular to the axis of the stripes, when the temperature is decreased. The results are interpreted in terms of a competition between shape and magnetoelastic anisotropies.

Magnetic properties on the surface of FeAl stripes induced by nanosecond pulsed laser irradiation

“…Here, it should be noted that there have been several experimental results on the magnetization reversal in magnetic stripe patterns. 1,6,14,15 For example, Ni 80 Fe 20 , Co, or amorphous Co 72 Si 28 stripe patterns have the magnetic easy (hard) axis in the direction parallel (perpendicular) to the stripes due to their strong shape anisotropy. 1,14,15 These magnetization reversals can be explained by the coherent rotation of SW model.…”