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Title: Control of c-axis orientation of L1_0-FePd in dual-phase-equilibrium FePd/Fe thin films
Authors: Ichitsubo, T.  KAKEN_id
Takashima, S.
Matsubara, E.  kyouindb  KAKEN_id  orcid (unconfirmed)
Tsukimoto, S.
Tamada, Y.
Ono, T.
Author's alias: 市坪, 哲
Keywords: amorphous state
ferromagnetic materials
iron alloys
magnetic anisotropy
magnetic multilayers
magnetic recording
magnetic thin films
palladium alloys
permanent magnets
phase separation
soft magnetic materials
tensile strength
Issue Date: Feb-2011
Publisher: American Institute of Physics
Journal title: Journal of Applied Physics
Volume: 109
Issue: 3
Thesis number: 033513
Abstract: This work establishes a method of controlling the c-axis-oriented structure of α-Fe (soft magnetic)/L1_0-FePd (hard magnetic) thin films in the dual-phase compositional region in thermal equilibrium. Two types of thin films were prepared; one is a single-layered thin film, and the other is a multilayered film, [FePd(x nm)/Fe(5 nm)]_n (x: thickness, n: the number of multilayers), both of which are deposited on silica glass substrates. For single-layered films, the ordering process is retarded by phase separation that requires long-range diffusion. In this case, the 〈111〉 oriented domains preferentially grow from the film surface, and the c-axis-oriented structure is not obtained. On the contrary, for multilayered films, each FePd layer can undergo ordering without phase separation subject to the constraint of strong biaxial tensile stress resulting from the difference in the thermal contractions between Fe/FePd film and the silica glass substrate. Consequently, the L1_0 domains with c-axis orientation in the normal direction of the film surface are preferentially formed in the initial amorphouslike structure, eventually leading to the desired c-axis-oriented structure.
Rights: © 2011 American Institute of Physics
DOI(Published Version): 10.1063/1.3544466
Appears in Collections:Journal Articles

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