title: Magnetostriction and magnetic heterogeneities in iron-gallium.
abstract: Iron-gallium alloys Fe(1-x)Ga(x) exhibit an exceptional increase in magnetostriction with gallium content. We present small-angle neutron scattering investigations on a Fe(0.81)Ga(0.19) single crystal. We uncover heterogeneities with an average spacing of 15 nm and with magnetizations distinct from the matrix. The moments in and around the heterogeneities are observed to reorient with an applied magnetic field or mechanical strain. We discuss the possible roles played by nanoscale magnetic heterogeneities in the mechanism for magnetostriction in this material.
authors.affiliation: Laboratory for Neutron Scattering, Paul Scherrer Institut, CH 5232 Villigen, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Laver
authors.forename: C
authors.initials: C
authors.lastname: Mudivarthi
authors.forename: J R
authors.initials: JR
authors.lastname: Cullen
authors.forename: A B
authors.initials: AB
authors.lastname: Flatau
authors.forename: W-C
authors.initials: WC
authors.lastname: Chen
authors.forename: S M
authors.initials: SM
authors.lastname: Watson
authors.forename: M
authors.initials: M
authors.lastname: Wuttig