Magnetic behavior of amorphous CoP cylinder arrays

Shima, Mutsuhiro; Hwang, M.; Ross, C. A.

doi:10.1063/1.1555835

Cited by 19 publications

(11 citation statements)

References 26 publications

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“…26 It is obvious from the shape of the hysteresis loops that the easy axis of magnetization of the samples is parallel to the wire axis and the hard axis is perpendicular to the wire axis. This agrees with the predictions of a micromagnetic model proposed by Shima et al 27 for a cylinder of amorphous Co-P. If certain criteria concerning dimensions and magnetic exchange length are satisfied ͑as calculation shows them to be for our wires͒, then the magnetization will lie parallel to the axis of the cylinder with some spreading at the top and bottom faces.…”

Section: Discussionsupporting

confidence: 79%

Co-rich cobalt platinum nanowire arrays: Effects of annealing

Peng

Jones

et al. 2005

Journal of Applied Physics

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The effects of annealing on the crystal structure and magnetic properties of Co-rich cobalt platinum nanowire arrays embedded in anodic aluminium oxide membranes have been investigated. For this purpose, a rapid thermal annealing to temperatures of 300°C to 800°C has been used. Transmission electron microscopy and scanning electron microscopy show that the nanowires have a mean diameter of 14 nm and an estimated wire density of 7.8ϫ 10 10 cm −2 . From x-ray diffraction patterns, we find that the nanowires are hcp and possess a preferred texture in which the c axis of the grains tends to lie along the major axis of the wire. Vibrating sample magnetometry measurements indicate that the easy axis is along the nanowire axis direction. Hysteresis loops, saturation magnetization, squareness ratio ͑M r / M s ͒, and coercivity ͑perpendicular and parallel to the nanowire axis͒ have all been investigated as a function of the annealing temperature ͑T A ͒. Coercivity parallel to the wire axis first increases with T A , attains a maximum at 600°C ͑which is 150% of the as-deposited sample͒, and then decreases. By contrast there is relatively little change in the coercivity measured perpendicular to the wires. The saturation magnetization for the as-deposited sample is 1360 emu/ cc and remains almost constant for annealing temperatures up to 500°C: for T A Ͼ 500°C it decreases significantly. The maximum ͑M r / M s ͒ ratio attained in this study is 0.99, the highest value reported thus far for cobalt platinum alloy nanowires. The data suggest that these materials are potential candidates for high-density magnetic recording media.

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Section: Discussionsupporting

confidence: 79%

Co-rich cobalt platinum nanowire arrays: Effects of annealing

Peng

Jones

et al. 2005

Journal of Applied Physics

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“…The data for Ni 100Àx P x nanowire arrays were normalized to pure Ni magnetization. The coercive field value of about 5 kA/m measured for the inplane field direction for amorphous Co 80 P 20 nanowire arrays is comparable with the ones published recently on amorphous CoP 100 nm cylinder arrays [5].…”

Section: Article In Presssupporting

confidence: 86%

Preparation and magnetic properties of amorphous NiP and CoP nanowire arrays

Chiriac

Moga

Urse

et al. 2004

Journal of Magnetism and Magnetic Materials

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“…In the first stage, the silver electrolyte solution was prepared from Ag(NO 3 with 200 nm Au film as electrode layer. The coated template was first immersed in an aqueous solution and kept at low vacuum environment to enhance the solution into the pores.…”

Section: Methodsmentioning

confidence: 99%

“…The fabrication of magnetic metal arrays has been intensely investigated recently because they shows potential utilization in magnetic recording [1][2][3][4][5]. It was reported that magnetic period nanostructure arrays as an ultra-high-density magnetic storage can achieve recording densities of more than 100 Gbit/in.…”

Section: Introductionmentioning

confidence: 99%