Microstructure and magnetic properties of Co-C nanogranular films

Y. H. Lee; Y. S. Huang; J. F. Min; G. M. Wu; L. Horng

doi:10.1016/j.jmmm.2006.10.947

Microstructure and magnetic properties of Co-C nanogranular films

Y. H. Lee, Y. S. Huang, J. F. Min, G. M. Wu, L. Horng

Department of Physics

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

Nanogranular films of Co-C were fabricated by DC magnetron sputtering at high (30 mTorr) and low (5 mTorr) pressures with Co concentration controlled at about 40 at%. The granular morphology of the as-deposited film remains unchanged, and is altered, respectively, for 30 and 5 mTorr upon annealing. At annealing temperature T_a≥500 °C, the phase is changed from hexagonal closed-pack (HCP) Co to faulted HCP Co plus FCC Co for 30 mTorr, and to Co₂C for 5 mTorr. Both the grain size and the coercivity increase with increase in T_a for 30 mTorr. The largest H_c=381 Oe is obtained at T_a=600 °C. Different microstructures and magnetic properties of the films made at the high and low pressures are compared and discussed.

Original language	English
Pages (from-to)	e913-e915
Journal	Journal of Magnetism and Magnetic Materials
Volume	310
Issue number	2 SUPPL. PART 3
DOIs	https://doi.org/10.1016/j.jmmm.2006.10.947
Publication status	Published - 2007 Mar 1

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1016/j.jmmm.2006.10.947

Fingerprint Dive into the research topics of 'Microstructure and magnetic properties of Co-C nanogranular films'. Together they form a unique fingerprint.

Cite this

@article{c50e1379f79e4bc496cc616f25bbfa58,

title = "Microstructure and magnetic properties of Co-C nanogranular films",

abstract = "Nanogranular films of Co-C were fabricated by DC magnetron sputtering at high (30 mTorr) and low (5 mTorr) pressures with Co concentration controlled at about 40 at%. The granular morphology of the as-deposited film remains unchanged, and is altered, respectively, for 30 and 5 mTorr upon annealing. At annealing temperature Ta≥500 °C, the phase is changed from hexagonal closed-pack (HCP) Co to faulted HCP Co plus FCC Co for 30 mTorr, and to Co2C for 5 mTorr. Both the grain size and the coercivity increase with increase in Ta for 30 mTorr. The largest Hc=381 Oe is obtained at Ta=600 °C. Different microstructures and magnetic properties of the films made at the high and low pressures are compared and discussed.",

author = "Lee, {Y. H.} and Huang, {Y. S.} and Min, {J. F.} and Wu, {G. M.} and L. Horng",

year = "2007",

month = mar,

day = "1",

doi = "10.1016/j.jmmm.2006.10.947",

language = "English",

volume = "310",

pages = "e913--e915",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier",

number = "2 SUPPL. PART 3",

}

TY - JOUR

T1 - Microstructure and magnetic properties of Co-C nanogranular films

AU - Lee, Y. H.

AU - Huang, Y. S.

AU - Min, J. F.

AU - Wu, G. M.

AU - Horng, L.

PY - 2007/3/1

Y1 - 2007/3/1

N2 - Nanogranular films of Co-C were fabricated by DC magnetron sputtering at high (30 mTorr) and low (5 mTorr) pressures with Co concentration controlled at about 40 at%. The granular morphology of the as-deposited film remains unchanged, and is altered, respectively, for 30 and 5 mTorr upon annealing. At annealing temperature Ta≥500 °C, the phase is changed from hexagonal closed-pack (HCP) Co to faulted HCP Co plus FCC Co for 30 mTorr, and to Co2C for 5 mTorr. Both the grain size and the coercivity increase with increase in Ta for 30 mTorr. The largest Hc=381 Oe is obtained at Ta=600 °C. Different microstructures and magnetic properties of the films made at the high and low pressures are compared and discussed.

AB - Nanogranular films of Co-C were fabricated by DC magnetron sputtering at high (30 mTorr) and low (5 mTorr) pressures with Co concentration controlled at about 40 at%. The granular morphology of the as-deposited film remains unchanged, and is altered, respectively, for 30 and 5 mTorr upon annealing. At annealing temperature Ta≥500 °C, the phase is changed from hexagonal closed-pack (HCP) Co to faulted HCP Co plus FCC Co for 30 mTorr, and to Co2C for 5 mTorr. Both the grain size and the coercivity increase with increase in Ta for 30 mTorr. The largest Hc=381 Oe is obtained at Ta=600 °C. Different microstructures and magnetic properties of the films made at the high and low pressures are compared and discussed.

UR - http://www.scopus.com/inward/record.url?scp=33847682181&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33847682181&partnerID=8YFLogxK

U2 - 10.1016/j.jmmm.2006.10.947

DO - 10.1016/j.jmmm.2006.10.947

M3 - Article

AN - SCOPUS:33847682181

VL - 310

SP - e913-e915

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

SN - 0304-8853

IS - 2 SUPPL. PART 3

ER -