title: Ferromagnetism of MnAs studied by heteroepitaxial films on GaAs(001).
abstract: Thin epitaxial films of MnAs--promising candidates for the spin injection into semiconductors--are well known to undergo simultaneously a first-order structural and magnetic phase transition at 10-40 degrees C. The evolution of stress and magnetization of MnAs/GaAs(001), both measured quantitatively with our cantilever beam magnetometer at the coexistence region of alpha-MnAs and beta-MnAs, reveal an orthorhombically distorted unit cell of the ferromagnetic phase, which provides important clues on the origin of ferromagnetism in MnAs.
authors.affiliation: Paul-Drude-Institut für Festkörperelektronik, Hausvogteiplatz 5-7, D-10117 Berlin, Germany.
authors.forename: A K
authors.initials: AK
authors.lastname: Das
authors.forename: C
authors.initials: C
authors.lastname: Pampuch
authors.forename: A
authors.initials: A
authors.lastname: Ney
authors.forename: T
authors.initials: T
authors.lastname: Hesjedal
authors.forename: L
authors.initials: L
authors.lastname: Däweritz
authors.forename: R
authors.initials: R
authors.lastname: Koch
authors.forename: K H
authors.initials: KH
authors.lastname: Ploog