Magnetic hardening in FePt nanostructured films

Journal Article · Mon Mar 31 23:00:00 EST 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.364681· OSTI ID:342618

Liu, J P; Liu, Y; Luo, C P; Shan, Z S; Sellmyer, D J ^[1]

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1. Behlen Laboratory of Physics and Center for Materials Research and Analysis, University of Nebraska, Lincoln, Nebraska 68588-0113 (United States)

FePt films have been prepared by sputtering Fe/Pt multilayers onto glass or silicon substrates. The thickness of the Fe and Pt layers was adjusted with the Fe:Pt atomic ratio from about 1:1 to 2:1. Magnetic hardening is observed after heat treatment at elevated temperatures, which led to coercivity values exceeding 20 kOe in samples with an Fe:Pt ratio around 1.2:1. The hardening originates from the formation of the tetragonal FePt phase with high magnetocrystalline anisotropy and a favorable microstructure. Two-phase composite films containing hard and soft phases were obtained when the Fe:Pt ratio increased. Under optimized processing conditions, composite films with energy products larger than 30 MGOe at room temperature have been successfully produced. {copyright} {ital 1997 American Institute of Physics.}

• DOE Contract Number: FG02-86ER45262
• OSTI ID: 342618
• Report Number(s): CONF-961141--
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COERCIVE FORCE
FERROMAGNETIC MATERIALS
HARDENING
HEAT TREATMENTS
IRON ALLOYS
MAGNETIC PROPERTIES
MAGNETIZATION
MICROSTRUCTURE
PERMANENT MAGNETS
PLATINUM ALLOYS
SPUTTERING
THIN FILMS