Unique magnetostriction of Fe68.8Pd31.2 attributable to twinning

Jake Steiner; Abdellah Lisfi; Tomoyuki Kakeshita; Takashi Fukuda; Manfred Wuttig

doi:10.1038/srep34259

Unique magnetostriction of Fe_68.8Pd_31.2 attributable to twinning

Sci Rep. 2016 Sep 30:6:34259. doi: 10.1038/srep34259.

Authors

Jake Steiner¹, Abdellah Lisfi², Tomoyuki Kakeshita³, Takashi Fukuda³, Manfred Wuttig¹

Affiliations

¹ University of Maryland, Department of Materials Science and Engineering, College Park, MD 20902, USA.
² Morgan State Univeristy, Department of Physics, Baltimore, MD 21251, USA.
³ Osaka University, Department of Materials Science and Engineering, Suita, Osaka 565-0871, Japan.

Abstract

Fe_68.8Pd_31.2 exhibits an anomalously large magnetostriction of ~400 ppm at room temperature as well as linear, isotropic, and hysteresis free magnetization behavior. This near perfectly reversible magnetic response is attributable to the presence of a large number of premartensitic magnetoelastic twin clusters present in the system made possible through the elastic softening that occurs near a martensitic transformation temperature of 252 K. It is proposed that the twin clusters in the material reduce both internal elastic and magnetic energy, causing the elastic and magnetic behavior of the material to be intimately linked. In such a framework, the anisotropy energy becomes extremely low causing the material to bear no crystalline dependence on magnetization, and application of a magnetic field causes simultaneous magnetic and twin domain movement which relaxes the system.