Magnetic anisotropy at nanoscale

TL;DR

This paper discusses the unique magnetic anisotropy observed in nanoscale thin layers, highlighting a specific in-plane anisotropy that differs from larger objects and is explained by a particular free energy functional.

Contribution

It introduces a peculiar form of free energy functional that describes nanoscale magnetic anisotropy, which is not applicable to larger-scale objects.

Findings

Identification of a specific in-plane magnetic anisotropy in nanoscale layers

Introduction of a free energy functional explaining this anisotropy

Demonstration of size-dependent magnetic behavior

Abstract

Nanoscale objects often behave differently than their 'normal-sized' counterparts. Sometimes it is enough to be small in just one direction to exhibit unusual features. One example of such a phenomenon is a very specific in-plane magnetic anisotropy observed sometimes in very thin layers of various materials. Here we recall a peculiar form of the free energy functional nicely describing the experimental findings but completely irrelevant and thus never observed in larger objects.