Magnetic properties and magnetization reversal of CoSm ∥ Cr thin films

Z. S. Shan, S. S. Malhotra, Sy-Hwang Liou, Yi Liu, M. Yu, David J Sellmyer

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

In this paper the magnetic and structural properties of CoSm thin films with a Cr underlayer (CoSm ∥ Cr) are presented, with emphasis on the measurements of anisotropy at room and low temperature and magnetization reversal. The grain size of the Cr underlayer is about 250 Å and the thin CoSm layer (e.g., 240 Å) inherits this grain size. The CoSm layer consists of nanocrystallites, about 50 Å in diameter, embedded in an amorphous matrix. The Ar pressure, CoSm layer-thickness, and temperature dependencies of magnetic properties including magnetization, coercivity and especially the anisotropy were investigated systematically. CoSm ∥ Cr with coercivity up to 4.2 kOe at room temperature has been prepared. The intrinsic anisotropy is 4 × 106 and 1.4 × 107 erg/cm3 at room temperature for CoSm(240 Å) ∥ Cr and CoSm(960 Å) ∥ Cr, respectively, and both increase to 3.9 × 107 erg/cm3 at 10 K. Magnetization reversal studies indicate that the coercivity mechanism changes from wall pinning for samples prepared at lower Ar pressure (5-12 mT) to single-particle coherent rotation for samples prepared at higher pressure (30 mT). The correlations between the microstructure and magnetic properties are discussed.

Original languageEnglish (US)
Pages (from-to)323-336
Number of pages14
JournalJournal of Magnetism and Magnetic Materials
Volume161
DOIs
StatePublished - Aug 1 1996

Fingerprint

Magnetization reversal
coercivity
Magnetic properties
Coercive force
magnetic properties
Thin films
magnetization
anisotropy
Anisotropy
room temperature
thin films
grain size
Temperature
Nanocrystallites
low pressure
Structural properties
Magnetization
microstructure
matrices
Microstructure

Keywords

  • CoSm film
  • Coercivity mechanism
  • Magnetic anisotropy
  • Magnetic switching volume
  • Magnetization reversal
  • Microstructure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Magnetic properties and magnetization reversal of CoSm ∥ Cr thin films. / Shan, Z. S.; Malhotra, S. S.; Liou, Sy-Hwang; Liu, Yi; Yu, M.; Sellmyer, David J.

In: Journal of Magnetism and Magnetic Materials, Vol. 161, 01.08.1996, p. 323-336.

Research output: Contribution to journalArticle

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abstract = "In this paper the magnetic and structural properties of CoSm thin films with a Cr underlayer (CoSm ∥ Cr) are presented, with emphasis on the measurements of anisotropy at room and low temperature and magnetization reversal. The grain size of the Cr underlayer is about 250 {\AA} and the thin CoSm layer (e.g., 240 {\AA}) inherits this grain size. The CoSm layer consists of nanocrystallites, about 50 {\AA} in diameter, embedded in an amorphous matrix. The Ar pressure, CoSm layer-thickness, and temperature dependencies of magnetic properties including magnetization, coercivity and especially the anisotropy were investigated systematically. CoSm ∥ Cr with coercivity up to 4.2 kOe at room temperature has been prepared. The intrinsic anisotropy is 4 × 106 and 1.4 × 107 erg/cm3 at room temperature for CoSm(240 {\AA}) ∥ Cr and CoSm(960 {\AA}) ∥ Cr, respectively, and both increase to 3.9 × 107 erg/cm3 at 10 K. Magnetization reversal studies indicate that the coercivity mechanism changes from wall pinning for samples prepared at lower Ar pressure (5-12 mT) to single-particle coherent rotation for samples prepared at higher pressure (30 mT). The correlations between the microstructure and magnetic properties are discussed.",
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AU - Sellmyer, David J

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N2 - In this paper the magnetic and structural properties of CoSm thin films with a Cr underlayer (CoSm ∥ Cr) are presented, with emphasis on the measurements of anisotropy at room and low temperature and magnetization reversal. The grain size of the Cr underlayer is about 250 Å and the thin CoSm layer (e.g., 240 Å) inherits this grain size. The CoSm layer consists of nanocrystallites, about 50 Å in diameter, embedded in an amorphous matrix. The Ar pressure, CoSm layer-thickness, and temperature dependencies of magnetic properties including magnetization, coercivity and especially the anisotropy were investigated systematically. CoSm ∥ Cr with coercivity up to 4.2 kOe at room temperature has been prepared. The intrinsic anisotropy is 4 × 106 and 1.4 × 107 erg/cm3 at room temperature for CoSm(240 Å) ∥ Cr and CoSm(960 Å) ∥ Cr, respectively, and both increase to 3.9 × 107 erg/cm3 at 10 K. Magnetization reversal studies indicate that the coercivity mechanism changes from wall pinning for samples prepared at lower Ar pressure (5-12 mT) to single-particle coherent rotation for samples prepared at higher pressure (30 mT). The correlations between the microstructure and magnetic properties are discussed.

AB - In this paper the magnetic and structural properties of CoSm thin films with a Cr underlayer (CoSm ∥ Cr) are presented, with emphasis on the measurements of anisotropy at room and low temperature and magnetization reversal. The grain size of the Cr underlayer is about 250 Å and the thin CoSm layer (e.g., 240 Å) inherits this grain size. The CoSm layer consists of nanocrystallites, about 50 Å in diameter, embedded in an amorphous matrix. The Ar pressure, CoSm layer-thickness, and temperature dependencies of magnetic properties including magnetization, coercivity and especially the anisotropy were investigated systematically. CoSm ∥ Cr with coercivity up to 4.2 kOe at room temperature has been prepared. The intrinsic anisotropy is 4 × 106 and 1.4 × 107 erg/cm3 at room temperature for CoSm(240 Å) ∥ Cr and CoSm(960 Å) ∥ Cr, respectively, and both increase to 3.9 × 107 erg/cm3 at 10 K. Magnetization reversal studies indicate that the coercivity mechanism changes from wall pinning for samples prepared at lower Ar pressure (5-12 mT) to single-particle coherent rotation for samples prepared at higher pressure (30 mT). The correlations between the microstructure and magnetic properties are discussed.

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