Magnetic characterization of intermetallic compound FePt and FePtX (X=B, Ni) thin films

• Published in: Journal of magnetism and magnetic materials Vol. 205; no. 1; pp. 1 - 6
• Main Authors: Li, Ning, Lairson, Bruce M., Kwon, Oh-Hun
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-10-1999; Elsevier Science
• Subjects: Anisotropy energy; Applied sciences; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Domain structure (including magnetic bubbles); Exact sciences and technology; L10 intermetallic compound; Longitudinal recording; Magnetic properties and materials; Magnetic properties of surface, thin films and multilayers; Magnetic recording materials; Metals. Metallurgy; Physics; Rotational transverse magnetization; Studies of specific magnetic materials; Thin films; Rotational transverse magnetization; Thin films; L10 intermetallic compound; Anisotropy energy; Longitudinal recording; Nickel alloys; Magnetization; Intermetallic compounds; Platinum alloys; Ternary alloys; Composition effect; Magnetic hysteresis; Iron alloys; Experimental study; Rotation; Boron alloys; Binary alloys; Magnetic anisotropy; Magnetic domains; Coercive force; Recording material; Transition element alloys; Saturation magnetization
• ISSN: 0304-8853
• DOI: 10.1016/S0304-8853(99)00489-8

VSM rotational transverse magnetization technique was used to characterize the anisotropy field of FePt and FePtX (X=B, Ni) thin films with comparison to commercial CoCrTaPt media. Anisotropy energy was derived.
H
c
/H
k
was used as an indicator for coherent rotation of a single domain. Interactions between magnetic domains were characterized by Kelly–Henkel plot. Interactive field factor was used as a coupling factor similar to
δM. Correlations between coercive force, magnetic anisotropy of grains, and the degree of magnetic isolation among grains were discussed. B and Ni had been added as diluting agent to the FePt system to decrease saturation magnetization, coercivity, anisotropy field and anisotropy energy. These doping elements also decrease the magnetic coupling between neighboring domains, and promote coherent rotation inside each domain.