Effects of MgO and MgO/Pd seed-layers on perpendicular magnetic anisotropy of CoPd thin films

Jungho Ko, Jangyup Son, Soogil Lee, Sanghoon Kim, Jongill Hong

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We studied the effects of MgO and MgO/Pd seed-layers on perpendicular magnetic anisotropy in co-sputtered CoPd films. CoPd films with the MgO seed-layer showed perpendicular magnetic properties that were superior to those with another after annealing. The loop squareness was unity, indicating strong perpendicular magnetic anisotropy, when the MgO seed-layer was thicker than 2 nm. We observed that the out-of-plane CoPd (111) texture was strongly developed, as well as the in-plane tensile stress in the CoPd films. The magnetoelastic anisotropy coming from a negative magnetostriction λ111 under the in-plane tensile stress dominating over other anisotropies is likely responsible for creating such strong perpendicular magnetic anisotropy. In the case of the MgO/Pd seed-layer, the CoPd films showed mixed anisotropy having both in-plane and out-of-plane magnetic anisotropy components after annealing. The appearance of the strong (100) texture of the CoPd films with the MgO/Pd seed-layer is believed to have caused the decrease in the perpendicular magnetic anisotropy that originated from the magnetoelastic anisotropy due to the additional contribution from the positive magnetostriction λ 100 but less contribution from the negative magnetostriction λ111 when the CoPd films are under in-plane tensile stress.

Original languageEnglish
Pages (from-to)8252-8255
Number of pages4
JournalThin Solid Films
Volume519
Issue number23
DOIs
Publication statusPublished - 2011 Sep 30

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Magnetic anisotropy
Seed
seeds
Thin films
anisotropy
Magnetostriction
Anisotropy
thin films
Tensile stress
plane stress
magnetostriction
tensile stress
Textures
Annealing
textures
Magnetic properties
annealing
unity
magnetic properties

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

Ko, Jungho ; Son, Jangyup ; Lee, Soogil ; Kim, Sanghoon ; Hong, Jongill. / Effects of MgO and MgO/Pd seed-layers on perpendicular magnetic anisotropy of CoPd thin films. In: Thin Solid Films. 2011 ; Vol. 519, No. 23. pp. 8252-8255.
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Effects of MgO and MgO/Pd seed-layers on perpendicular magnetic anisotropy of CoPd thin films. / Ko, Jungho; Son, Jangyup; Lee, Soogil; Kim, Sanghoon; Hong, Jongill.

In: Thin Solid Films, Vol. 519, No. 23, 30.09.2011, p. 8252-8255.

Research output: Contribution to journalArticle

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