Easy axis orientation of Strontium ferrite thin films described by spin reorientation

TL;DR

This paper models the in-plane orientation of the magnetic easy axis in sputtered strontium ferrite thin films using a classical Heisenberg Hamiltonian, predicting a spin reorientation temperature that matches experimental data.

Contribution

It introduces a theoretical model explaining the in-plane easy axis orientation and predicts the spin reorientation temperature based on energy parameters.

Findings

The model predicts the spin reorientation temperature at 500°C.

The theoretical predictions agree with experimental observations.

The easy axis orientation depends on specific energy parameters.

Abstract

In plane orientation of magnetic easy axis of sputtered strontium hexaferrite thin films has been explained using classical Heisenberg Hamiltonian. The variation of average value of in plane spin component with temperature was plotted in order to determine the temperature at which easy axis is oriented in the plane of the strontium ferrite film. The average value of in plane spin component in this 2-D model reaches zero at one particular temperature. This particular temperature obtained using our theoretical model agrees with the experimental value of the temperature of rf sputtered polycrystalline strontium ferrite thin films deposited on polycrystalline Al2O3 substrates (500 0C). This spin reorientation temperature solely depends on the values of energy parameters used in our modified Heisenberg Hamiltonian equation.