Magnetic and structural properties of MBE-grown oxidic multilayers

Book · Fri Nov 01 04:00:00 EST 1996

OSTI ID:392201

Bloemen, P J.H.; Kohlhepp, J T; Jonge, W J.M. de ^[1]; Wolf, R M; Stegge, J aan de; Reinders, A; Jungblut, R M; Zaag, P.J. van der ^[2]

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1. Eindhoven Univ. of Technology (Netherlands). Dept. of Physics
2. Philips Research Labs., Eindhoven (Netherlands)

Multilayers composed of oxides including Fe{sub 3}O{sub 4}, Co{sub x}Fe{sub 3{minus}x}O{sub 4}, CoO, NiO and MgO have been grown epitaxially by MBE on MgO(100) single crystal substrates. These structures can be grown with a high crystallinity in the form of flat layers having sharp interfaces. RHEED studies which commonly yielded sharp streaks accompanied by Kikuchi lines show that, for instance, growth of CoO on Fe{sub 3}O{sub 4} changes the RHEED pattern form from that consistent with a spinel structure to that of a rocksalt structure within about one and a half unit cell of CoO. STM studies on a 400 {angstrom} Fe{sub 3}O{sub 4} layer displaying atomic resolution enabled us to identify the origin of the reconstruction that one commonly observes in the RHEED and LEED patterns for magnetite. Regarding important fundamental magnetic parameters, relevant thickness dependencies were mapped out using localized magneto-optical Kerr effect experiments performed on several samples that routinely included one or multiple wedge shaped layers. These studies revealed the existence of a region in the Fe{sub 3}O{sub 4} layer near the interfaces which exhibits no net magnetic moment, strain driven perpendicular orientated magnetization for the CoO/Fe{sub 3}O{sub 4}(100) and CoO/Co{sub x}Fe{sub 3{minus}x}O{sub 4}(100) bilayer systems, and information on the thickness dependence of the magnetic interlayer coupling across an MgO spacer layer.

• OSTI ID: 392201
• Report Number(s): CONF-951155--; ISBN 1-55899-304-5
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
COBALT OXIDES
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
ELECTRON BEAMS
ELECTRON DIFFRACTION
EVAPORATION
EXPERIMENTAL DATA
FERROMAGNETIC RESONANCE
HYSTERESIS
INTERFACES
IRON OXIDES
KERR EFFECT
MAGNESIUM OXIDES
MAGNETIC PROPERTIES
NICKEL OXIDES
ORIENTATION
OXYGEN
PHYSICAL VAPOR DEPOSITION
X-RAY DIFFRACTION