Switching field distribution of planar-patterned CrPt{sub 3} nanodots fabricated by ion irradiation

Journal Article · Fri Apr 01 00:00:00 EDT 2011 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3565492· OSTI ID:21560116

Suharyadi, E ^[1]; Oshima, D; Kato, T; Iwata, S ^[1]

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1. Department of Quantum Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603 (Japan)

Planar-patterned CrPt{sub 3} ordered L1{sub 2} nanodots with various bit sizes (D) from 220 to 55 nm were fabricated by the local irradiation of 30 keV of Kr{sup +} ions not by conventional physical etching. Patterned nanodots with bit size {<=} 65 nm show either dark or bright contrast, suggesting that they have single domain structure. Switching field distribution of nanodots was studied by taking magnetic force microcopy images, in the progress of the magnetization reversal. As-prepared CrPt{sub 3} film exhibited perpendicular hysteresis loop with the coercivity of 5.5 kOe. Compared with the as-prepared film, the average switching field (H{sub sf}) of the CrPt{sub 3} nanodots increased as 6.5, 8.5, and 9.2 kOe while the switching field distribution ({Delta}H{sub sf}) decreased as 6.8, 3.6, and 2.8 kOe, for the patterned nanodots with bit sizes of 220, 150, 65 nm, respectively. We found that the small {Delta}H{sub sf}/H{sub sf} is possible in the high density planar bit patterned media fabricated by ion irradiation.

• OSTI ID: 21560116
• Journal Information: Journal of Applied Physics, Vol. 109, Issue 7; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: DOI: 10.1063/1.3565492; (c) 2011 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
CHROMIUM ALLOYS
COERCIVE FORCE
DENSITY
DISTRIBUTION
DOMAIN STRUCTURE
ETCHING
FILMS
HYSTERESIS
ION BEAMS
KEV RANGE 10-100
KRYPTON IONS
LOCAL IRRADIATION
MAGNETIC MATERIALS
MAGNETIZATION
NANOSTRUCTURES
PLATINUM ALLOYS
QUANTUM DOTS
ALLOYS
BEAMS
CHARGED PARTICLES
ENERGY RANGE
IONS
IRRADIATION
KEV RANGE
MATERIALS
PHYSICAL PROPERTIES
PLATINUM METAL ALLOYS
SURFACE FINISHING
TRANSITION ELEMENT ALLOYS