Shell/core structure and magnetic properties of carbon-coated Fe-Co(C) nanocapsules

Z. D. Zhang; J. G. Zheng; I. Skorvanek; G. H. Wen; J. Kovac; F. W. Wang; J. L. Yu; Z. J. Li; X. L. Dong; S. R. Jin; W. Liu; X. X. Zhang

doi:10.1088/0953-8984/13/9/314

Shell/core structure and magnetic properties of carbon-coated Fe-Co(C) nanocapsules

Z. D. Zhang, J. G. Zheng, I. Skorvanek, G. H. Wen, J. Kovac, F. W. Wang, J. L. Yu, Z. J. Li, X. L. Dong, S. R. Jin, W. Liu, X. X. Zhang

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96 Scopus citations

Abstract

Shell-core structures of Fe(C), Co(C) and Fe-Co(C) nanocapsules, prepared by an arc discharge process in a mixture of methane and helium, have been demonstrated by means of high-resolution transmission electron microscopy (HRTEM). These nanoscale magnetic cores are protected by graphite shells. It has been found that the zero-field-cooled (ZFC) magnetization of Fe-Co(C) nanocapsules that display different characteristics in three temperature ranges can be well interpreted in terms of the unblocking of magnetization of small single-domain particles and the depinning of large multidomain particles. The saturation magnetization of these nanocapsules decreases monotonically, while the coercivity decreases significantly with increasing temperature.

Original language	English (US)
Pages (from-to)	1921-1929
Number of pages	9
Journal	Journal of Physics Condensed Matter
Volume	13
Issue number	9
DOIs	https://doi.org/10.1088/0953-8984/13/9/314
State	Published - Mar 5 2001
Externally published	Yes

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics

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10.1088/0953-8984/13/9/314

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title = "Shell/core structure and magnetic properties of carbon-coated Fe-Co(C) nanocapsules",

abstract = "Shell-core structures of Fe(C), Co(C) and Fe-Co(C) nanocapsules, prepared by an arc discharge process in a mixture of methane and helium, have been demonstrated by means of high-resolution transmission electron microscopy (HRTEM). These nanoscale magnetic cores are protected by graphite shells. It has been found that the zero-field-cooled (ZFC) magnetization of Fe-Co(C) nanocapsules that display different characteristics in three temperature ranges can be well interpreted in terms of the unblocking of magnetization of small single-domain particles and the depinning of large multidomain particles. The saturation magnetization of these nanocapsules decreases monotonically, while the coercivity decreases significantly with increasing temperature.",

author = "Zhang, {Z. D.} and Zheng, {J. G.} and I. Skorvanek and Wen, {G. H.} and J. Kovac and Wang, {F. W.} and Yu, {J. L.} and Li, {Z. J.} and Dong, {X. L.} and Jin, {S. R.} and W. Liu and Zhang, {X. X.}",

year = "2001",

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doi = "10.1088/0953-8984/13/9/314",

language = "English (US)",

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pages = "1921--1929",

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TY - JOUR

T1 - Shell/core structure and magnetic properties of carbon-coated Fe-Co(C) nanocapsules

AU - Zhang, Z. D.

AU - Zheng, J. G.

AU - Skorvanek, I.

AU - Wen, G. H.

AU - Kovac, J.

AU - Wang, F. W.

AU - Yu, J. L.

AU - Li, Z. J.

AU - Dong, X. L.

AU - Jin, S. R.

AU - Liu, W.

AU - Zhang, X. X.

PY - 2001/3/5

Y1 - 2001/3/5

N2 - Shell-core structures of Fe(C), Co(C) and Fe-Co(C) nanocapsules, prepared by an arc discharge process in a mixture of methane and helium, have been demonstrated by means of high-resolution transmission electron microscopy (HRTEM). These nanoscale magnetic cores are protected by graphite shells. It has been found that the zero-field-cooled (ZFC) magnetization of Fe-Co(C) nanocapsules that display different characteristics in three temperature ranges can be well interpreted in terms of the unblocking of magnetization of small single-domain particles and the depinning of large multidomain particles. The saturation magnetization of these nanocapsules decreases monotonically, while the coercivity decreases significantly with increasing temperature.

AB - Shell-core structures of Fe(C), Co(C) and Fe-Co(C) nanocapsules, prepared by an arc discharge process in a mixture of methane and helium, have been demonstrated by means of high-resolution transmission electron microscopy (HRTEM). These nanoscale magnetic cores are protected by graphite shells. It has been found that the zero-field-cooled (ZFC) magnetization of Fe-Co(C) nanocapsules that display different characteristics in three temperature ranges can be well interpreted in terms of the unblocking of magnetization of small single-domain particles and the depinning of large multidomain particles. The saturation magnetization of these nanocapsules decreases monotonically, while the coercivity decreases significantly with increasing temperature.

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U2 - 10.1088/0953-8984/13/9/314

DO - 10.1088/0953-8984/13/9/314

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SN - 0953-8984

VL - 13

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EP - 1929

JO - Journal of Physics Condensed Matter

JF - Journal of Physics Condensed Matter

IS - 9

ER -

Shell/core structure and magnetic properties of carbon-coated Fe-Co(C) nanocapsules

Abstract

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