Microwave absorption in Ni-Zn ferrites through the Curie transition

H. Montiel; G. Alvarez; M. P. Gutiérrez; R. Zamorano; R. Valenzuela

doi:10.1016/j.jallcom.2003.09.074

Microwave absorption in Ni-Zn ferrites through the Curie transition

H. Montiel, G. Alvarez, M. P. Gutiérrez, R. Zamorano, R. Valenzuela

Research output: Contribution to journal › Conference article › peer-review

67 Scopus citations

Abstract

Microwave absorption measurements were carried out on Ni _0.35Zn_0.65Fe₂O₄ polycrystalline ferrites, at a constant frequency of 9.4GHz (X-Band) and dc magnetic fields (H_dc) in the 0-0.8T range. The measuring temperature was varied from 300 to 500K. A clear evolution from ferromagnetic resonance (FMR) to paramagnetic resonance (EPR) was observed as a function of temperature which is related with the passage through the Curie point (∼430K), as observed by thermal variations of magnetic permeability. In addition, a low field (H _dc<0.06T) absorption signal was observed with the same phase as the FMR absorption. However, in contrast with FMR, this signal exhibited hysteresis by cycling the dc field and disappears with temperature (∼350K) before the Curie point is reached. The assignment of this signal as due to non-resonant microwave absorption processes by the partially magnetized sample is discussed.

Original language	English
Pages (from-to)	141-143
Number of pages	3
Journal	Journal of Alloys and Compounds
Volume	369
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2003.09.074
State	Published - 28 Apr 2004
Externally published	Yes
Event	Proceedings of the VI Latin American Workshop on Magnetism - Chihuahua, Mexico Duration: 7 Apr 2003 → 11 Apr 2003

Keywords

Ferrites
Ferromagnetic resonance
Magnetic measurements

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10.1016/j.jallcom.2003.09.074

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title = "Microwave absorption in Ni-Zn ferrites through the Curie transition",

abstract = "Microwave absorption measurements were carried out on Ni 0.35Zn0.65Fe2O4 polycrystalline ferrites, at a constant frequency of 9.4GHz (X-Band) and dc magnetic fields (Hdc) in the 0-0.8T range. The measuring temperature was varied from 300 to 500K. A clear evolution from ferromagnetic resonance (FMR) to paramagnetic resonance (EPR) was observed as a function of temperature which is related with the passage through the Curie point (∼430K), as observed by thermal variations of magnetic permeability. In addition, a low field (H dc<0.06T) absorption signal was observed with the same phase as the FMR absorption. However, in contrast with FMR, this signal exhibited hysteresis by cycling the dc field and disappears with temperature (∼350K) before the Curie point is reached. The assignment of this signal as due to non-resonant microwave absorption processes by the partially magnetized sample is discussed.",

keywords = "Ferrites, Ferromagnetic resonance, Magnetic measurements",

author = "H. Montiel and G. Alvarez and Guti{\'e}rrez, {M. P.} and R. Zamorano and R. Valenzuela",

year = "2004",

month = apr,

day = "28",

doi = "10.1016/j.jallcom.2003.09.074",

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

volume = "369",

pages = "141--143",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

number = "1-2",

note = "Proceedings of the VI Latin American Workshop on Magnetism ; Conference date: 07-04-2003 Through 11-04-2003",

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TY - JOUR

T1 - Microwave absorption in Ni-Zn ferrites through the Curie transition

AU - Montiel, H.

AU - Alvarez, G.

AU - Gutiérrez, M. P.

AU - Zamorano, R.

AU - Valenzuela, R.

PY - 2004/4/28

Y1 - 2004/4/28

N2 - Microwave absorption measurements were carried out on Ni 0.35Zn0.65Fe2O4 polycrystalline ferrites, at a constant frequency of 9.4GHz (X-Band) and dc magnetic fields (Hdc) in the 0-0.8T range. The measuring temperature was varied from 300 to 500K. A clear evolution from ferromagnetic resonance (FMR) to paramagnetic resonance (EPR) was observed as a function of temperature which is related with the passage through the Curie point (∼430K), as observed by thermal variations of magnetic permeability. In addition, a low field (H dc<0.06T) absorption signal was observed with the same phase as the FMR absorption. However, in contrast with FMR, this signal exhibited hysteresis by cycling the dc field and disappears with temperature (∼350K) before the Curie point is reached. The assignment of this signal as due to non-resonant microwave absorption processes by the partially magnetized sample is discussed.

AB - Microwave absorption measurements were carried out on Ni 0.35Zn0.65Fe2O4 polycrystalline ferrites, at a constant frequency of 9.4GHz (X-Band) and dc magnetic fields (Hdc) in the 0-0.8T range. The measuring temperature was varied from 300 to 500K. A clear evolution from ferromagnetic resonance (FMR) to paramagnetic resonance (EPR) was observed as a function of temperature which is related with the passage through the Curie point (∼430K), as observed by thermal variations of magnetic permeability. In addition, a low field (H dc<0.06T) absorption signal was observed with the same phase as the FMR absorption. However, in contrast with FMR, this signal exhibited hysteresis by cycling the dc field and disappears with temperature (∼350K) before the Curie point is reached. The assignment of this signal as due to non-resonant microwave absorption processes by the partially magnetized sample is discussed.

KW - Ferrites

KW - Ferromagnetic resonance

KW - Magnetic measurements

UR - http://www.scopus.com/inward/record.url?scp=1842526716&partnerID=8YFLogxK

U2 - 10.1016/j.jallcom.2003.09.074

DO - 10.1016/j.jallcom.2003.09.074

M3 - Artículo de la conferencia

AN - SCOPUS:1842526716

SN - 0925-8388

VL - 369

SP - 141

EP - 143

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

IS - 1-2

T2 - Proceedings of the VI Latin American Workshop on Magnetism

Y2 - 7 April 2003 through 11 April 2003

ER -

Microwave absorption in Ni-Zn ferrites through the Curie transition

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