A theoretical investigation of the specific heat of superlattices in a magnetic field

TL;DR

This paper provides a theoretical analysis of how the specific heat of superlattices varies with an external magnetic field, considering complex interactions and anisotropies at the spin wave level.

Contribution

It introduces a detailed theoretical model that incorporates multiple magnetic interactions and anisotropies to study specific heat behavior in superlattices under magnetic fields.

Findings

Non-trivial behavior of specific heat due to canting transition.

Magnetic field influences low-temperature specific heat significantly.

Dipolar interactions and anisotropy affect spin wave contributions.

Abstract

We analyze the specific heat variations as a function of an external magnetic field of a simple model of superlattice that includes (i) in--plane ferromagnetic exchange, (ii) interplane ferromagnetic exchange, (iii) dipolar interactions, (iv) magnetocristalline anisotropy. The calculations are carried out at the spin wave level. The interplay between the existence of a canting transition and the anisotropy of the structure generates non trivial behavior for the spin wave contribution to the low temperature specific heat as a function of an external magnetic field when dipolar interactions and magnetocristalline anisotropy are taken into account.