Unique magnetostriction of Fe68.8Pd31.2attributable to twinning.
Fe68.8Pd31.2exhibits 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.
University of Maryland, Department of Materials Science and Engineering, College Park, MD 20902, USA.
Jake
J
Steiner
Morgan State Univeristy, Department of Physics, Baltimore, MD 21251, USA.
Abdellah
A
Lisfi
Osaka University, Department of Materials Science and Engineering, Suita, Osaka 565-0871, Japan.
Tomoyuki
T
Kakeshita
Osaka University, Department of Materials Science and Engineering, Suita, Osaka 565-0871, Japan.
Takashi
T
Fukuda
University of Maryland, Department of Materials Science and Engineering, College Park, MD 20902, USA.
Manfred
M
Wuttig
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