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

doi:10.1016/j.tsf.2011.03.087

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

Department of Materials Science and Engineering

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

6 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 language	English
Pages (from-to)	8252-8255
Number of pages	4
Journal	Thin Solid Films
Volume	519
Issue number	23
DOIs	https://doi.org/10.1016/j.tsf.2011.03.087
Publication status	Published - 2011 Sept 30

Bibliographical note

Funding Information:
This research was supported in part by Basic Science Research Program through the National Research Foundation ( 2010-0015924 ) and Grant from the Center for Nanoscale Mechatronics & Manufacturing , one of the 21st Century Frontier Research Programs ( 2010K000189 ) funded by the Ministry of Education, Science and Technology in Korea, and by the IT R&D program of MKE/KEIT ( KI002189 , Technology Development of 30 nm Level High Density Perpendicular STT-MRAM).

All Science Journal Classification (ASJC) codes

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

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10.1016/j.tsf.2011.03.087

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

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.",

author = "Jungho Ko and Jangyup Son and Soogil Lee and Sanghoon Kim and Jongill Hong",

note = "Funding Information: This research was supported in part by Basic Science Research Program through the National Research Foundation ( 2010-0015924 ) and Grant from the Center for Nanoscale Mechatronics & Manufacturing , one of the 21st Century Frontier Research Programs ( 2010K000189 ) funded by the Ministry of Education, Science and Technology in Korea, and by the IT R&D program of MKE/KEIT ( KI002189 , Technology Development of 30 nm Level High Density Perpendicular STT-MRAM).",

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AU - Ko, Jungho

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AU - Lee, Soogil

AU - Kim, Sanghoon

AU - Hong, Jongill

N1 - Funding Information: This research was supported in part by Basic Science Research Program through the National Research Foundation ( 2010-0015924 ) and Grant from the Center for Nanoscale Mechatronics & Manufacturing , one of the 21st Century Frontier Research Programs ( 2010K000189 ) funded by the Ministry of Education, Science and Technology in Korea, and by the IT R&D program of MKE/KEIT ( KI002189 , Technology Development of 30 nm Level High Density Perpendicular STT-MRAM).

PY - 2011/9/30

Y1 - 2011/9/30

N2 - 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.

AB - 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.

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

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