The magnetic properties of annealed graphite-coated Ni and Co nanocrystals

J. A. Block; J. Parvin; J. L. Alpers; T. Sezen; R. Laduca; J. J. Host; V. P. Dravid

doi:10.1109/20.706331

The magnetic properties of annealed graphite-coated Ni and Co nanocrystals

J. A. Block^*, J. Parvin, J. L. Alpers, T. Sezen, R. Laduca, J. J. Host, V. P. Dravid

^*Corresponding author for this work

Materials Science and Engineering

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

5 Scopus citations

Abstract

Magnetic studies of graphite-coated nanocrystals of nickel and cobalt (5 - 50 nm) synthesized in a special fullerene arc chamber are reported. Magnetization measurements as a function of temperature in the range 20 - 900 °C indicate the ferromagnetic nature of the nanocrystals. Upon heating and recooling of the nanocrystals a larger magnetization was measured. The dependence of room temperature M., Mr, and Hc of the nanocrystals on annealing temperature is reported. The data are consistent with increase in size of single domain particles, or transition of the nanocrystals from single domain to multi-domain due to particle size growth in the annealing process.

Original language	English (US)
Pages (from-to)	982-984
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	34
Issue number	4 PART 1
DOIs	https://doi.org/10.1109/20.706331
State	Published - 1998

Funding

K. Parvin: [email protected], J.J. Host: equinoxiih@,aol.com V.P. Dravid v-dravi@,nwu.edu, The work at SJSU has been supported by NSF, Grants DMR-9405941, DMR-9706870, and PHY-9322073, and Research Corporation, Grant HS-0399. Financial support for the work at Northwestem University has been provided by NSF, Grant DMR-9357513.

Keywords

Ferromagnets
Graphite-coated nanocrystals
Single domain particles

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/20.706331

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title = "The magnetic properties of annealed graphite-coated Ni and Co nanocrystals",

abstract = "Magnetic studies of graphite-coated nanocrystals of nickel and cobalt (5 - 50 nm) synthesized in a special fullerene arc chamber are reported. Magnetization measurements as a function of temperature in the range 20 - 900 °C indicate the ferromagnetic nature of the nanocrystals. Upon heating and recooling of the nanocrystals a larger magnetization was measured. The dependence of room temperature M., Mr, and Hc of the nanocrystals on annealing temperature is reported. The data are consistent with increase in size of single domain particles, or transition of the nanocrystals from single domain to multi-domain due to particle size growth in the annealing process.",

keywords = "Ferromagnets, Graphite-coated nanocrystals, Single domain particles",

author = "Block, \{J. A.\} and J. Parvin and Alpers, \{J. L.\} and T. Sezen and R. Laduca and Host, \{J. J.\} and Dravid, \{V. P.\}",

note = "Funding Information: K. Parvin: [email protected], J.J. Host: equinoxiih@,aol.com V.P. Dravid v-dravi@,nwu.edu, The work at SJSU has been supported by NSF, Grants DMR-9405941, DMR-9706870, and PHY-9322073, and Research Corporation, Grant HS-0399. Financial support for the work at Northwestem University has been provided by NSF, Grant DMR-9357513.",

year = "1998",

doi = "10.1109/20.706331",

language = "English (US)",

volume = "34",

pages = "982--984",

journal = "IEEE Transactions on Magnetics",

issn = "0018-9464",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "4 PART 1",

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TY - JOUR

T1 - The magnetic properties of annealed graphite-coated Ni and Co nanocrystals

AU - Block, J. A.

AU - Parvin, J.

AU - Alpers, J. L.

AU - Sezen, T.

AU - Laduca, R.

AU - Host, J. J.

AU - Dravid, V. P.

N1 - Funding Information: K. Parvin: [email protected], J.J. Host: equinoxiih@,aol.com V.P. Dravid v-dravi@,nwu.edu, The work at SJSU has been supported by NSF, Grants DMR-9405941, DMR-9706870, and PHY-9322073, and Research Corporation, Grant HS-0399. Financial support for the work at Northwestem University has been provided by NSF, Grant DMR-9357513.

PY - 1998

Y1 - 1998

N2 - Magnetic studies of graphite-coated nanocrystals of nickel and cobalt (5 - 50 nm) synthesized in a special fullerene arc chamber are reported. Magnetization measurements as a function of temperature in the range 20 - 900 °C indicate the ferromagnetic nature of the nanocrystals. Upon heating and recooling of the nanocrystals a larger magnetization was measured. The dependence of room temperature M., Mr, and Hc of the nanocrystals on annealing temperature is reported. The data are consistent with increase in size of single domain particles, or transition of the nanocrystals from single domain to multi-domain due to particle size growth in the annealing process.

AB - Magnetic studies of graphite-coated nanocrystals of nickel and cobalt (5 - 50 nm) synthesized in a special fullerene arc chamber are reported. Magnetization measurements as a function of temperature in the range 20 - 900 °C indicate the ferromagnetic nature of the nanocrystals. Upon heating and recooling of the nanocrystals a larger magnetization was measured. The dependence of room temperature M., Mr, and Hc of the nanocrystals on annealing temperature is reported. The data are consistent with increase in size of single domain particles, or transition of the nanocrystals from single domain to multi-domain due to particle size growth in the annealing process.

KW - Ferromagnets

KW - Graphite-coated nanocrystals

KW - Single domain particles

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U2 - 10.1109/20.706331

DO - 10.1109/20.706331

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AN - SCOPUS:0032117508

SN - 0018-9464

VL - 34

SP - 982

EP - 984

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 4 PART 1

ER -

The magnetic properties of annealed graphite-coated Ni and Co nanocrystals

Abstract

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Keywords

ASJC Scopus subject areas

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