Observation of reversed hysteresis loops and negative coercivity in CoFeAlO magnetic thin films

N. D. Ha; T. S. Yoon; E. Gan'Shina; M. H. Phan; C. G. Kim; C. O. Kim

doi:10.1016/j.jmmm.2005.01.003

Observation of reversed hysteresis loops and negative coercivity in CoFeAlO magnetic thin films

N. D. Ha
, T. S. Yoon
, E. Gan'Shina
, M. H. Phan
, C. G. Kim
, C. O. Kim

Department of Physics and Chemistry

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

21 Scopus citations

Abstract

The magnetic and magneto-optical properties of CoFeAlO thin films fabricated by the RF magnetron reactive sputtering technique have been studied via vibrating sample magnetometer and the magneto-optical Kerr effect. It is found that, along the hard magnetization direction, the magnetic hysteresis loop is reversed and the coercive force is negative. This phenomenon can qualitatively be interpreted within the framework of the proposed two-layers model. It was also found that when as-deposited CoFeAlO thin films were annealed in vacuum (2×10^-7 Torr) at a temperature of 180 °C for 2 h, the negative coercivity disappeared. The relationship between the magnetic and microstructural behaviors of the thin films is discussed.

Original language	English
Pages (from-to)	126-131
Number of pages	6
Journal	Journal of Magnetism and Magnetic Materials
Volume	295
Issue number	2
DOIs	https://doi.org/10.1016/j.jmmm.2005.01.003
State	Published - Aug 2005

Bibliographical note

Funding Information:
This work was supported by the Korean Science and Engineering Foundation through the Research Center for Advanced Magnetic Materials at Chungnam National University and BK 21 program. E.Gan'shina acknowledges the support of the Brain Pool Program.

Keywords

Co-Fe-Al-O thin films
Kerr effect
Magneto-optics

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10.1016/j.jmmm.2005.01.003

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title = "Observation of reversed hysteresis loops and negative coercivity in CoFeAlO magnetic thin films",

abstract = "The magnetic and magneto-optical properties of CoFeAlO thin films fabricated by the RF magnetron reactive sputtering technique have been studied via vibrating sample magnetometer and the magneto-optical Kerr effect. It is found that, along the hard magnetization direction, the magnetic hysteresis loop is reversed and the coercive force is negative. This phenomenon can qualitatively be interpreted within the framework of the proposed two-layers model. It was also found that when as-deposited CoFeAlO thin films were annealed in vacuum (2×10-7 Torr) at a temperature of 180 °C for 2 h, the negative coercivity disappeared. The relationship between the magnetic and microstructural behaviors of the thin films is discussed.",

keywords = "Co-Fe-Al-O thin films, Kerr effect, Magneto-optics",

author = "Ha, \{N. D.\} and Yoon, \{T. S.\} and E. Gan'Shina and Phan, \{M. H.\} and Kim, \{C. G.\} and Kim, \{C. O.\}",

note = "Funding Information: This work was supported by the Korean Science and Engineering Foundation through the Research Center for Advanced Magnetic Materials at Chungnam National University and BK 21 program. E.Gan'shina acknowledges the support of the Brain Pool Program.",

year = "2005",

month = aug,

doi = "10.1016/j.jmmm.2005.01.003",

language = "English",

volume = "295",

pages = "126--131",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Observation of reversed hysteresis loops and negative coercivity in CoFeAlO magnetic thin films

AU - Ha, N. D.

AU - Yoon, T. S.

AU - Gan'Shina, E.

AU - Phan, M. H.

AU - Kim, C. G.

AU - Kim, C. O.

N1 - Funding Information: This work was supported by the Korean Science and Engineering Foundation through the Research Center for Advanced Magnetic Materials at Chungnam National University and BK 21 program. E.Gan'shina acknowledges the support of the Brain Pool Program.

PY - 2005/8

Y1 - 2005/8

N2 - The magnetic and magneto-optical properties of CoFeAlO thin films fabricated by the RF magnetron reactive sputtering technique have been studied via vibrating sample magnetometer and the magneto-optical Kerr effect. It is found that, along the hard magnetization direction, the magnetic hysteresis loop is reversed and the coercive force is negative. This phenomenon can qualitatively be interpreted within the framework of the proposed two-layers model. It was also found that when as-deposited CoFeAlO thin films were annealed in vacuum (2×10-7 Torr) at a temperature of 180 °C for 2 h, the negative coercivity disappeared. The relationship between the magnetic and microstructural behaviors of the thin films is discussed.

AB - The magnetic and magneto-optical properties of CoFeAlO thin films fabricated by the RF magnetron reactive sputtering technique have been studied via vibrating sample magnetometer and the magneto-optical Kerr effect. It is found that, along the hard magnetization direction, the magnetic hysteresis loop is reversed and the coercive force is negative. This phenomenon can qualitatively be interpreted within the framework of the proposed two-layers model. It was also found that when as-deposited CoFeAlO thin films were annealed in vacuum (2×10-7 Torr) at a temperature of 180 °C for 2 h, the negative coercivity disappeared. The relationship between the magnetic and microstructural behaviors of the thin films is discussed.

KW - Co-Fe-Al-O thin films

KW - Kerr effect

KW - Magneto-optics

UR - https://www.scopus.com/pages/publications/22544481480

U2 - 10.1016/j.jmmm.2005.01.003

DO - 10.1016/j.jmmm.2005.01.003

M3 - Article

AN - SCOPUS:22544481480

SN - 0304-8853

VL - 295

SP - 126

EP - 131

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 2

ER -

Observation of reversed hysteresis loops and negative coercivity in CoFeAlO magnetic thin films

Abstract

Bibliographical note

Keywords

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