Magnetic Cluster Analysis Using MFM for CoCrTaPt Recording Media with Coercivities of 2-3 kOe

Takahoshi, H.; Chen, J.; Ishio, S.; Saito, Hitoshi; Kobayashi, Kazuo

doi:10.3379/jmsjmag.24.307

Cited by 6 publications

(1 citation statement)

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“…[9][10][11][12][13][14] Among the various patterning methods, ion irradiation patterning is attracting attention since when combined with stencil masks it permits a noncontact patterning process. 1-8 Nanoscale patterning of ferromagnetic films has also been studied intensively in the past decade using lithography techniques as well as self-organization processes to explore highdensity patterned media aimed at Tbit/ in.…”

Section: Introductionmentioning

confidence: 99%

Structural transition from L1 phase to A1 phase in FePt films caused by ion irradiation

Hasegawa

Pei

et al. 2006

Journal of Applied Physics

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Structure and magnetic properties of FePt(001) graded films deposited on glass substrates Domain wall assisted magnetization switching in (111) oriented L 1 0 FePt grown on a soft magnetic metallic glass Appl. Phys. Lett. 97, 072510 (2010); 10.1063/1.3479054 Phenomenological analysis of magnetization reversal process for L 1 0 -Fe Pt ( 001 ) particulate filmsThe effect of ion irradiation ͑B + ,Cr + ,Ga + , and Nb + ͒ on the crystalline structure and magnetic properties of L1 0 ͑face-centered tetragonal structure͒ FePt films was investigated. Irradiating with Cr + , Ga + , and Nb + ions of less than 1 at. % ͑1.6ϫ 10 15 ions/ cm 2 ͒ dose yielded an almost ideal structural transition from the L1 0 to A1 ͑face-centered cubic structure͒ phase withoutdamage to the surface of the film. This structural transition was accompanied by a change in magnetic properties from a hard magnet with a coercivity H c of ϳ7 kOe to a soft magnet with H c Ͻ 1 kOe. A two-dimensional pattern composed of hard magnetic L1 0 and soft magnetic A1 phases was fabricated by using a focused Ga + ion beam.

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