Structure and magnetic properties of Co grown on yttria-stabilized cubic zirconia substrates

Abstract

Cobalt films have been grown on yttria-stabilized cubic zirconia (YSZ) (100) and (110) substrates by molecular beam epitaxy. Both hcp(0001) and fcc(111) twin structures and fcc(110) films have been successfully fabricated on the YSZ(100) and (110), respectively. For the Co on YSZ(100) case, the Co films possess either hcp(0001) or fcc(111) crystals with in-plane 30° rotation. For the Co on YSZ(110) case, the structural relationship is YSZ(110)[100] ‖ Co(110)[1–10]. All the films display an isotropiclike magnetic anisotropy with the coercivity increasing abruptly above its martensitic transition temperature. The coercivity decreases with increasing the thickness of Co films from 100 Å to 500 Å; and increases as the deposited temperature above 500 °C. Co films grown on YSZ(100) are in favor of the layer by layer growth, and Co films grown on YSZ(110) are in favor of the island growth.

Structure and magnetic properties of Co/Pt single- and bi-crystal multilayers

“…2(c) displayed a combination of Figs. 2(a) and (b).As previous reports on Co bicrystal structures[7,8], it indicated that Co/Pt multilayers have two FCC(1 1 1) variants that meet at an angle of 30 . In fact, the formation of Co/Pt bicrystal structures originated from the Pt buffer layer.…”

“…Before preparing the Co/Pt multilayers, a 100 ( A thick Pt buffer layer was deposited on the substrates at 600 C. The details of substrates cleaning and films growth were elaborated elsewhere [7][8][9]. The crystal structures of the epitaxial films were examined by in situ reflection high-energy electron diffraction (RHEED) and ex situ y À 2y Xray diffraction (XRD).…”

“…Therefore, choosing of good underlying templates (substrates or buffer layers) for films deposition were important [5,6]. Moreover, because the lattice parameter of cubic zirconia (a ¼ 5:14 ( A) is much larger for 3d transition metals, it is possible to grow special structures like Co bicrystal films [7,8]. Therefore, in this study, cubic zirconia stabilized with 9.5% mol Y 2 O 3 (YSZ) with (1 0 0) crystal orientations was chosen as a substrate to study the crystal structure and magnetic behavior of Co/Pt multilayers.…”

Lattice strain accommodation and absence of pre-transition phases in Ni50Mn25+x In25−x

“…The presence of impurities tends to curtail the long range order of the strain vector leading to a frozen disordered ferroelastic phase. This phase is akin to cluster glassy phase in impurity doped magnetic materials [1,2] or relaxor ferroelectrics [3][4][5]. Several reports depicting the existence of strain glass phase have been reported in the literature [6,7].…”