Magnetic properties of nanostructured CoSm/FeCo films

Journal Article · Tue Aug 01 04:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.52.3441· OSTI ID:91897

Al-Omari, I A; Sellmyer, D J ^[1]

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1. Behlen Laboratory of Physics and Center for Materials Research Analysis, University of Nebraska, Lincoln, Nebraska 68588-0111 (United States)

Co{sub 80}Sm{sub 20}/Fe{sub 65}Co{sub 35} bilayer and multilayer films with Cr underlayers and overlayers have been fabricated and studied. All the samples prepared have in-plane anisotropy and the hysteresis loops were simple single loops for {ital t}{sub FeCo}{le}300 A indicating that the two phases are strongly exchange coupled. The magnetization of these samples is found to increase with increasing FeCo layer thickness for a fixed CoSm layer thickness. The coercivity, anisotropy constant, and anisotropy field for films with fixed CoSm layer thickness were found to decrease with increasing FeCo layer thickness. The magnetization squareness values of the hysteresis loops in the direction parallel to the film plane, for different CoSm and FeCo layer thicknesses, were found to be close to {ital S}{approx}0.75. The energy products for these samples vary from about 6 MG Oe at room temperature to 26 MG Oe at 30 K. The shape and the behavior of the initial loops and the minor loops suggest that wall pinning is the dominant coercivity mechanism in these films. Reversible demagnetization curves were measured and found to be consistent with the behavior expected for ``exchange-spring`` magnets.

• DOE Contract Number: FG02-86ER45262
• OSTI ID: 91897
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 5 Vol. 52; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
CHEMISORPTION
CHROMIUM
COBALT ALLOYS
COBALT BASE ALLOYS
COERCIVE FORCE
FILMS
HYSTERESIS
IRON BASE ALLOYS
LAYERS
MAGNETIC PROPERTIES
MAGNETIZATION
SAMARIUM ALLOYS
SORPTIVE PROPERTIES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
THICKNESS