Magnetic properties of nanophase CoFe2O4 particles

V. Blaskov; V. Petkov; V. Rusanov; Ll M. Martinez; B. Martinez; J. S. Muñoz; M. Mikhov

doi:10.1016/S0304-8853(96)00277-6

Magnetic properties of nanophase CoFe₂O₄ particles

V. Blaskov, V. Petkov, V. Rusanov, Ll M. Martinez, B. Martinez, J. S. Muñoz, M. Mikhov

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

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Abstract

Fine CoFe₂O₄ particles with average size of 50 Å have been produced by coprecipitation from Fe(II) and Co(II) solutions followed by a low-temperature calcination. The ac and dc magnetic susceptibilities, as well as magnetization, were studied between 5 and 300 K. The disordered system of such particles behaves superparamagnetically above T_B = 250 K and ferrimagnetically below this temperature. T_B can be considered as mean blocking temperature at zero field in the timescale of ac (111.1 Hz) magnetic susceptibility measurements. The anisotropy field exceeds 50 kOe below 150 K. The maximal coercivity measured at 5 K is 14.5 kOe and the maximal measured magnetization is 14.6 emu/g, which is much lower than the saturation magnetization of bulk CoFe₂O₄.

Original language	English
Pages (from-to)	331-337
Number of pages	7
Journal	Journal of Magnetism and Magnetic Materials
Volume	162
Issue number	2-3
DOIs	https://doi.org/10.1016/S0304-8853(96)00277-6
State	Published - Sep 1996

Keywords

Co ferrite
Fine particles
Superparamagnetism

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10.1016/S0304-8853(96)00277-6

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title = "Magnetic properties of nanophase CoFe2O4 particles",

abstract = "Fine CoFe2O4 particles with average size of 50 {\AA} have been produced by coprecipitation from Fe(II) and Co(II) solutions followed by a low-temperature calcination. The ac and dc magnetic susceptibilities, as well as magnetization, were studied between 5 and 300 K. The disordered system of such particles behaves superparamagnetically above TB = 250 K and ferrimagnetically below this temperature. TB can be considered as mean blocking temperature at zero field in the timescale of ac (111.1 Hz) magnetic susceptibility measurements. The anisotropy field exceeds 50 kOe below 150 K. The maximal coercivity measured at 5 K is 14.5 kOe and the maximal measured magnetization is 14.6 emu/g, which is much lower than the saturation magnetization of bulk CoFe2O4.",

keywords = "Co ferrite, Fine particles, Superparamagnetism",

author = "V. Blaskov and V. Petkov and V. Rusanov and Martinez, {Ll M.} and B. Martinez and Mu{\~n}oz, {J. S.} and M. Mikhov",

note = "Funding Information: The work is supported by Bulgarian Foundation for Scientific Investigations under contract d0-453/1994. One of us (M.M.) is grateful to the Spanish Ministry of Science and Education for the grant during his stay in UAB, Spain. We would like to thank the Alexander yon Humbolt Foundation for the financial support kindly given for the supply with a new MiSssbauer source.",

year = "1996",

month = sep,

doi = "10.1016/S0304-8853(96)00277-6",

language = "English",

volume = "162",

pages = "331--337",

journal = "Journal of Magnetism and Magnetic Materials",

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TY - JOUR

T1 - Magnetic properties of nanophase CoFe2O4 particles

AU - Blaskov, V.

AU - Petkov, V.

AU - Rusanov, V.

AU - Martinez, Ll M.

AU - Martinez, B.

AU - Muñoz, J. S.

AU - Mikhov, M.

N1 - Funding Information: The work is supported by Bulgarian Foundation for Scientific Investigations under contract d0-453/1994. One of us (M.M.) is grateful to the Spanish Ministry of Science and Education for the grant during his stay in UAB, Spain. We would like to thank the Alexander yon Humbolt Foundation for the financial support kindly given for the supply with a new MiSssbauer source.

PY - 1996/9

Y1 - 1996/9

N2 - Fine CoFe2O4 particles with average size of 50 Å have been produced by coprecipitation from Fe(II) and Co(II) solutions followed by a low-temperature calcination. The ac and dc magnetic susceptibilities, as well as magnetization, were studied between 5 and 300 K. The disordered system of such particles behaves superparamagnetically above TB = 250 K and ferrimagnetically below this temperature. TB can be considered as mean blocking temperature at zero field in the timescale of ac (111.1 Hz) magnetic susceptibility measurements. The anisotropy field exceeds 50 kOe below 150 K. The maximal coercivity measured at 5 K is 14.5 kOe and the maximal measured magnetization is 14.6 emu/g, which is much lower than the saturation magnetization of bulk CoFe2O4.

AB - Fine CoFe2O4 particles with average size of 50 Å have been produced by coprecipitation from Fe(II) and Co(II) solutions followed by a low-temperature calcination. The ac and dc magnetic susceptibilities, as well as magnetization, were studied between 5 and 300 K. The disordered system of such particles behaves superparamagnetically above TB = 250 K and ferrimagnetically below this temperature. TB can be considered as mean blocking temperature at zero field in the timescale of ac (111.1 Hz) magnetic susceptibility measurements. The anisotropy field exceeds 50 kOe below 150 K. The maximal coercivity measured at 5 K is 14.5 kOe and the maximal measured magnetization is 14.6 emu/g, which is much lower than the saturation magnetization of bulk CoFe2O4.

KW - Co ferrite

KW - Fine particles

KW - Superparamagnetism

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U2 - 10.1016/S0304-8853(96)00277-6

DO - 10.1016/S0304-8853(96)00277-6

M3 - Article

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SP - 331

EP - 337

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

SN - 0304-8853

IS - 2-3

ER -

Magnetic properties of nanophase CoFe₂O₄ particles

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Keywords

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