Microwave non-resonant absorption in fine cobalt ferrite particles

M. E. Mata-Zamora; H. Montiel; G. Alvarez; J. M. Saniger; R. Zamorano; R. Valenzuela

doi:10.1016/j.jmmm.2007.03.011

Microwave non-resonant absorption in fine cobalt ferrite particles

M. E. Mata-Zamora, H. Montiel, G. Alvarez, J. M. Saniger, R. Zamorano, R. Valenzuela

Escuela Superior de Física y Matemáticas (ESFM)

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

22 Scopus citations

Abstract

Cobalt ferrite particles of average crystallite size of 11 nm were obtained by a sol--gel process at 400 °C. The powders were annealed at temperatures of 500, 600, 700 and 800 °C in air. Derivative microwave power absorption (dP/dH) measurements were carried out as a function of magnetic field (H_DC) at X band (9.4 GHz), in the field range -80-796 kA/m for all annealed temperatures. In order to compare the response of saturation magnetization measurements with high frequency measurements, we calculated the areas inside both the magnetization (A_M) and the absorption hysteresis loops (A_LFS). The dependence of these areas as a function of crystallite size is remarkably similar in both experiments.

Original language	English
Pages (from-to)	e532-e534
Journal	Journal of Magnetism and Magnetic Materials
Volume	316
Issue number	2 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.jmmm.2007.03.011
State	Published - Sep 2007

Keywords

Cobalt ferrite
Hysteresis
Microwave absorption

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10.1016/j.jmmm.2007.03.011

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title = "Microwave non-resonant absorption in fine cobalt ferrite particles",

abstract = "Cobalt ferrite particles of average crystallite size of 11 nm were obtained by a sol--gel process at 400 °C. The powders were annealed at temperatures of 500, 600, 700 and 800 °C in air. Derivative microwave power absorption (dP/dH) measurements were carried out as a function of magnetic field (HDC) at X band (9.4 GHz), in the field range -80-796 kA/m for all annealed temperatures. In order to compare the response of saturation magnetization measurements with high frequency measurements, we calculated the areas inside both the magnetization (AM) and the absorption hysteresis loops (ALFS). The dependence of these areas as a function of crystallite size is remarkably similar in both experiments.",

keywords = "Cobalt ferrite, Hysteresis, Microwave absorption",

author = "Mata-Zamora, {M. E.} and H. Montiel and G. Alvarez and Saniger, {J. M.} and R. Zamorano and R. Valenzuela",

note = "Funding Information: We acknowledge support from CONACYT-40507-F. Authors wish to express their gratitude to L. Ba{\~n}os of Institute Materials Research-UNAM for XRD analysis.",

year = "2007",

month = sep,

doi = "10.1016/j.jmmm.2007.03.011",

language = "Ingl{\'e}s",

volume = "316",

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journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

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TY - JOUR

T1 - Microwave non-resonant absorption in fine cobalt ferrite particles

AU - Mata-Zamora, M. E.

AU - Montiel, H.

AU - Alvarez, G.

AU - Saniger, J. M.

AU - Zamorano, R.

AU - Valenzuela, R.

N1 - Funding Information: We acknowledge support from CONACYT-40507-F. Authors wish to express their gratitude to L. Baños of Institute Materials Research-UNAM for XRD analysis.

PY - 2007/9

Y1 - 2007/9

N2 - Cobalt ferrite particles of average crystallite size of 11 nm were obtained by a sol--gel process at 400 °C. The powders were annealed at temperatures of 500, 600, 700 and 800 °C in air. Derivative microwave power absorption (dP/dH) measurements were carried out as a function of magnetic field (HDC) at X band (9.4 GHz), in the field range -80-796 kA/m for all annealed temperatures. In order to compare the response of saturation magnetization measurements with high frequency measurements, we calculated the areas inside both the magnetization (AM) and the absorption hysteresis loops (ALFS). The dependence of these areas as a function of crystallite size is remarkably similar in both experiments.

AB - Cobalt ferrite particles of average crystallite size of 11 nm were obtained by a sol--gel process at 400 °C. The powders were annealed at temperatures of 500, 600, 700 and 800 °C in air. Derivative microwave power absorption (dP/dH) measurements were carried out as a function of magnetic field (HDC) at X band (9.4 GHz), in the field range -80-796 kA/m for all annealed temperatures. In order to compare the response of saturation magnetization measurements with high frequency measurements, we calculated the areas inside both the magnetization (AM) and the absorption hysteresis loops (ALFS). The dependence of these areas as a function of crystallite size is remarkably similar in both experiments.

KW - Cobalt ferrite

KW - Hysteresis

KW - Microwave absorption

UR - http://www.scopus.com/inward/record.url?scp=34250336022&partnerID=8YFLogxK

U2 - 10.1016/j.jmmm.2007.03.011

DO - 10.1016/j.jmmm.2007.03.011

M3 - Artículo

SN - 0304-8853

VL - 316

SP - e532-e534

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 2 SPEC. ISS.

ER -

Microwave non-resonant absorption in fine cobalt ferrite particles

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Keywords

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