Atomistic simulations of magnetic amorphous solids: Magnetostriction, Barkhausen noise and novel singularities

• Published in: Europhysics letters Vol. 104; no. 4; pp. 47003 - 47007
• Main Authors: Dasgupta, Ratul, E. Hentschel, H. George, Procaccia, Itamar, Sen Gupta, Bhaskar
• Format: Journal Article
• Language: English
• Published: EDP Sciences, IOP Publishing and Società Italiana di Fisica 01.11.2013
• Subjects: 75.50.Kj
• ISSN: 0295-5075; 1286-4854
• DOI: 10.1209/0295-5075/104/47003

We present results of atomistic simulations of a new model of a magnetic amorphous solid subjected to mechanical strains and magnetic fields. Contrary to standard magnetic random systems which are studied on a lattice with random interaction, in the present approach all the randomness comes from the glassy nature of the material. The model employed offers new perspectives on important effects like plasticity and magnetostriction. It is shown that the plastic response in such systems exhibit singularities characterized by new exponents; the spatial structure of these plastic events requires a new coarse grained elasto-magnetic theory which is provided here.