Premartensitic transition driven by magnetoelastic interaction in bcc ferromagnetic \(Ni_{2}MnGa\)

We show that the magnetoelastic coupling between the magnetization and the amplitude of a short wavelength phonon enables the existence of a first order premartensitic transition from a bcc to a micromodulated phase in \(Ni_{2}MnGa\). Such a magnetoelastic coupling has been experimentally evidenced...

Full description

Saved in:
Bibliographic Details
Published inarXiv.org
Main Authors Planes, Antoni, Obrado, Eduard, Gonzalez-Comas, Alfons, Manosa, Lluis
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 23.09.1997
Subjects
Coupling
Ferromagnetism
Latent heat
Magnetic permeability
Magnetism
Online AccessGet full text

Cover

More Information
Summary:We show that the magnetoelastic coupling between the magnetization and the amplitude of a short wavelength phonon enables the existence of a first order premartensitic transition from a bcc to a micromodulated phase in \(Ni_{2}MnGa\). Such a magnetoelastic coupling has been experimentally evidenced by AC susceptibility and ultrasonic measurements under applied magnetic field. A latent heat around 9 J/mol has been measured using a highly sensitive calorimeter. This value is in very good agreement with the value predicted by a proposed model.
ISSN:2331-8422
DOI:10.48550/arxiv.9709246