Oscillating magnetocaloric effect of a 2D non-relativistic diamagnetic material

TL;DR

This paper investigates the oscillatory magnetocaloric effect in 2D non-relativistic diamagnetic materials like gold films, revealing significant entropy change oscillations depending on magnetic field and temperature, with potential applications in magnetic cooling.

Contribution

It provides a detailed analysis of the magnetocaloric properties of 2D diamagnetic materials, highlighting oscillations similar to de Haas-van Alphen effect and comparing entropy changes across different materials.

Findings

Oscillatory magnetocaloric effect observed in 2D diamagnetic materials.

Entropy change varies significantly with temperature and material.

Comparison shows higher entropy change in graphene at higher temperature.

Abstract

Among the magnetic materials, those with ferromagnetic character are, by far, the most studied in what concerns applications of the magnetocaloric effect. However, recently, diamagnetic materials received due attention never received before, and an oscillatory behavior, analogous to the de Haas-van Alphen effect, has been found. The present effort describes in details the magnetocaloric properties of a 2D non-relativistic material (a Gold thin film, for instance), where oscillations, depending on the reciprocal magnetic field $1/B$, are found. A comparison of the magnetic entropy change per electron for some cases is presented and we found $\approx10^{-1}$ k$_{\text{B}}$ (@109.3 K) for graphenes, $\approx10^{-5}$ k$_{\text{B}}$ (@0.7 K) for 2D Gold and $\approx 10^{-7}$ k$_{\text{B}}$ (@0.7 K) for 3D Gold.