L1{sub 0} FePt-oxide columnar perpendicular media with high coercivity and small grain size

Journal Article · Tue Jul 15 00:00:00 EDT 2008 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.2956691· OSTI ID:21137402

En, Yang; Laughlin, David E ^[1]

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1. Materials Science and Engineering Department and Data Storage Systems Center, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States)

Perpendicular L1{sub 0} ordered FePt-oxide two-phase thin films with an average grain size of {approx}7 nm were prepared by alternate sputtering of FePt and oxide at 475 deg. C. Very uniform and well-isolated columnar grains were obtained with coercivity as high as 7 kOe. It is found that the texture of thin films depends greatly on the thickness of FePt; SiO{sub 2} works better than MgO as the amorphous oxide, which provides for magnetic isolation of the FePt grains. The coercivity of the films rises with increasing grain size and thinner alternately sputtered single layers. Reducing the grain size to {approx}2.9 nm produces granular grains with a coercivity of 3.5 kOe.

• OSTI ID: 21137402
• Journal Information: Journal of Applied Physics, Vol. 104, Issue 2; Other Information: DOI: 10.1063/1.2956691; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
COERCIVE FORCE
DEPOSITION
GRAIN SIZE
IRON ALLOYS
LAYERS
MAGNESIUM OXIDES
NANOSTRUCTURES
PLATINUM ALLOYS
SILICON OXIDES
SPUTTERING
TEXTURE
THICKNESS
THIN FILMS