Exchange bias in Co/MnPt polycrystalline films on Si(100)/SiO 2 substrates with Ta underlayer

H. W. Chang, C. Y. Shen, F. T. Yuan, P. H. Pan, Y. H. Chien, C. R. Wang, Lance Horng, S. R. Jian

Research output: Contribution to journalArticle

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Abstract

Structure and magnetic properties of sputter-prepared Co(5 nm)/MnPt bilayer films with Ta underlayer and various thicknesses of MnPt layer (t MnPt ) have been studied. Ta underlayer is effective in promoting the ordering of MnPt layer, flattening the surface and interface, and therefore leading to the improvement of the exchange bias field (H E ). Nevertheless, higher annealing temperature leads to the interdiffusion and decrease H E . Besides, low H E of 8 kA/m with higher coercivity for the sample with thinner t MnPt = 10 nm might be related lower magnetic anisotropy energy for MnPt layer due to too thin antiferromagnetic layer, and therefore, H E is increased to 13.8–20.6 kA/m with increasing t MnPt to 30–100 nm. Larger grain size distribution and roughened interface found for the sample with thicker t MnPt = 100 nm may result in reduced H E . This study provides useful information to fabricate exchange-bias Co/L1 0 -MnPt system.

Original languageEnglish
Pages (from-to)834-839
Number of pages6
JournalThin Solid Films
Volume660
DOIs
Publication statusPublished - 2018 Aug 30

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Magnetic anisotropy
Coercive force
Magnetic properties
Annealing
Substrates
Temperature
flattening
coercivity
grain size
magnetic properties
anisotropy
annealing

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

Cite this

Chang, H. W., Shen, C. Y., Yuan, F. T., Pan, P. H., Chien, Y. H., Wang, C. R., ... Jian, S. R. (2018). Exchange bias in Co/MnPt polycrystalline films on Si(100)/SiO 2 substrates with Ta underlayer Thin Solid Films, 660, 834-839. https://doi.org/10.1016/j.tsf.2018.03.022
Chang, H. W. ; Shen, C. Y. ; Yuan, F. T. ; Pan, P. H. ; Chien, Y. H. ; Wang, C. R. ; Horng, Lance ; Jian, S. R. / Exchange bias in Co/MnPt polycrystalline films on Si(100)/SiO 2 substrates with Ta underlayer In: Thin Solid Films. 2018 ; Vol. 660. pp. 834-839.
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Exchange bias in Co/MnPt polycrystalline films on Si(100)/SiO 2 substrates with Ta underlayer . / Chang, H. W.; Shen, C. Y.; Yuan, F. T.; Pan, P. H.; Chien, Y. H.; Wang, C. R.; Horng, Lance; Jian, S. R.

In: Thin Solid Films, Vol. 660, 30.08.2018, p. 834-839.

Research output: Contribution to journalArticle

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AU - Chang, H. W.

AU - Shen, C. Y.

AU - Yuan, F. T.

AU - Pan, P. H.

AU - Chien, Y. H.

AU - Wang, C. R.

AU - Horng, Lance

AU - Jian, S. R.

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N2 - Structure and magnetic properties of sputter-prepared Co(5 nm)/MnPt bilayer films with Ta underlayer and various thicknesses of MnPt layer (t MnPt ) have been studied. Ta underlayer is effective in promoting the ordering of MnPt layer, flattening the surface and interface, and therefore leading to the improvement of the exchange bias field (H E ). Nevertheless, higher annealing temperature leads to the interdiffusion and decrease H E . Besides, low H E of 8 kA/m with higher coercivity for the sample with thinner t MnPt = 10 nm might be related lower magnetic anisotropy energy for MnPt layer due to too thin antiferromagnetic layer, and therefore, H E is increased to 13.8–20.6 kA/m with increasing t MnPt to 30–100 nm. Larger grain size distribution and roughened interface found for the sample with thicker t MnPt = 100 nm may result in reduced H E . This study provides useful information to fabricate exchange-bias Co/L1 0 -MnPt system.

AB - Structure and magnetic properties of sputter-prepared Co(5 nm)/MnPt bilayer films with Ta underlayer and various thicknesses of MnPt layer (t MnPt ) have been studied. Ta underlayer is effective in promoting the ordering of MnPt layer, flattening the surface and interface, and therefore leading to the improvement of the exchange bias field (H E ). Nevertheless, higher annealing temperature leads to the interdiffusion and decrease H E . Besides, low H E of 8 kA/m with higher coercivity for the sample with thinner t MnPt = 10 nm might be related lower magnetic anisotropy energy for MnPt layer due to too thin antiferromagnetic layer, and therefore, H E is increased to 13.8–20.6 kA/m with increasing t MnPt to 30–100 nm. Larger grain size distribution and roughened interface found for the sample with thicker t MnPt = 100 nm may result in reduced H E . This study provides useful information to fabricate exchange-bias Co/L1 0 -MnPt system.

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