Temperature dependent anisotropy and elastic effects in ferromagnetic nanowire arrays

TL;DR

This study investigates how temperature influences magnetic anisotropy and elastic effects in Nickel nanowire arrays, revealing size-dependent surface anisotropy transitions and strong magneto-elastic interactions relevant for spintronics and data storage.

Contribution

It demonstrates a diameter-dependent transition in magnetic anisotropy orientation and highlights the role of magneto-elastic effects across different nanowire sizes.

Findings

Surface anisotropy increases as diameter decreases.

A transition from parallel to perpendicular easy axis occurs at 50 nm.

Strong magneto-elastic effects are observed across temperature ranges.

Abstract

Temperature dependent Ferromagnetic Resonance measurements performed as a function of diameter on Nickel nanowire arrays reveal several interesting features in these systems. With diameter decrease from 100 nm to 15 nm, a transition induced by surface anisotropy increase is observed at 50 nm in easy axis orientation from parallel to perpendicular with respect to individual nanowire geometric axis. Analysis of resonance field $H_{res}$ temperature variation (between liquid Helium and room temperature) reveals underlying strong magneto-elastic effects in small and large diameter nanowire arrays with potential applications in recording and spintronics.