Effects of annealing temperature, atomic composition, film thickness on structure and magnetic properties of CoPt composite films

Zhang, Y.J.; Yang, Yanting; Liu, Y.; Wang, Y.X.; Li, X.Y.; Wang, D.D.; Cao, Junpeng; Yang, Nannan; Li, J.; Yang, See-Hun; Wei, Maobin; Yang, Jing

doi:10.1016/j.jallcom.2010.09.020

Cited by 16 publications

(8 citation statements)

References 45 publications

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“…Co-Pt binary alloy films have three ordered crystal structures with K u of higher than 10 7 erg/cc. They are the L1 0 order structure formed around Co 50 Pt 50 composition [17], the modified D0 19 -type order structure formed around Co 75 Pt 25 composition [18], and the L1 1 -type order structure formed around Co 50 Pt 50 composition [19]. All those ordered structures need high deposition temperature of 300°C-400°C or higher depending on the final phases.…”

Section: Mamr Media Developmentmentioning

confidence: 99%

Development of Spin-Torque Oscillators and High <inline-formula> <tex-math notation="LaTeX">${K}\!_{{u}}$ </tex-math></inline-formula> CoPt Media With Small Grain Size for Microwave-Assisted Magnetic Recording

et al. 2015

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We report the selection of materials and design of spin-torque oscillators (STOs) which are able to operate in an alternative magnetic field (variable frequency) of magnitude ∼8000 Oe, generate large enough in-plane ac magnetic field in the recording media, and have tunable high frequency at low driving current for microwave-assisted magnetic recording (MAMR) based on micromagnetic simulations. The mechanism and integration approaches of STOs with the current recording system to have the least driving current are also presented. This paper also covers the material choice, layer-stack optimization, and process development on Co x Pt 1−x alloy films with extremely high coercivity of more than 1.5 T (K u of about 1.5 × 10 7 erg/cc), well-isolated small grains of size 6-7 nm, for the extension of perpendicular magnetic recording and MAMR.Index Terms-Anisotropy energy, composite reference layer, CoPt, magnetization precession, microwave assisted magnetic recording (MAMR), spin-torque oscillator (STO).

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Section: Mamr Media Developmentmentioning

confidence: 99%

Development of Spin-Torque Oscillators and High <inline-formula> <tex-math notation="LaTeX">${K}\!_{{u}}$ </tex-math></inline-formula> CoPt Media With Small Grain Size for Microwave-Assisted Magnetic Recording

et al. 2015

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“…7 In depositing Co or bimetallic Co based films by means of MOCVD, one should use Co compounds whose structure does not include cobalt-oxygen bonds in order to avoid cobalt oxide formation. Several cobalt compounds with Co-C bonds, namely, Co 2 (CO) 8 , Co(C 5 H 5 ) 2 and their derivatives C 5 H 5 Co(CO) 2 , Co(CO) 3 NO and [Co 2 (CO) 6 (g 2 -Me 3 SiCCH)], were adopted as MOCVD precursors for Co film deposition. However, these compounds have some disadvantages that limiting their application: undesired reactions in the gas phase and low thermal stability in the condensed phase.…”

Section: Introductionmentioning

confidence: 99%

MOCVD growth and study of magnetic Co films

Dorovskikh

Hairullin

Сысоев

et al. 2016

Surface Engineering

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The Co(N'acN'ac) 2 complex, namely bis(2-methylamino-4-methyliminato-penten) cobalt(II), was for the first time used as a precursor for producing Co films via metal-organic chemical vapour deposition. This chelate exhibits good volatility ln (P/Pu)526?45-14006?7/T(K) at moderate temperature values (382-427 K). Co films were grown on Si (100) substrates and studied by Xray diffraction, extended X-ray absorption fine structure, atomic force and scanning electron microscopy, energy dispersive X-ray analysis and optical profilometry. Deposition conditions corresponding to the optimal electrical and magnetic characteristics of Co thin films are found.

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“…The magnetic nanoparticles (NPs), such as CoPt, FePt, or FePd with the CuAu-type (L1 0 ) ordered structure, attract special attentions in view of their potential applications in molecular imaging, special magnetic media, and the biological and medical purposes [1][2][3]. The strong perpendicular magnetic anisotropy and the high chemical stability make L1 0 -CoPt as the important materials for the high-density information storage [4].…”

Section: Introductionmentioning

confidence: 99%