Effect of a change in thickness on the structural and perpendicular magnetic properties of L10 ordered FePd ultra-thin films with (001) texture

Jungho Ko; Taejin Bae; Jongill Hong

doi:10.1063/1.4769737

Effect of a change in thickness on the structural and perpendicular magnetic properties of L1₀ ordered FePd ultra-thin films with (001) texture

Jungho Ko, Taejin Bae, Jongill Hong

Department of Materials Science and Engineering

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

27 Citations (Scopus)

Abstract

Ultra-thin FePd films were prepared by the sputter-deposition of Fe and Pd layers. After annealing at 500°C, they transformed to a (001) oriented L1₀ ordered phase from an A1 disordered phase and changed their anisotropy to perpendicular magnetic anisotropy from in-plane. The ordered parameter was about 0.7 for all thicknesses of the FePd films. The 20nm-thick FePd film exhibited the squareness of 0.3 because both the disordered phase with in-plane magnetic anisotropy and ordered phase with perpendicular magnetic anisotropy existed in the FePd film. The disordered phase was reduced, and the L1₀ phase became predominated as the thickness of the FePd films decreased. In particular, when the FePd films were 3 and 5nm thick, the squareness became unity while maintaining a thermal stability factor of over 60. The uniaxial magnetic anisotropy constant K_u was over 1×10⁷erg/cm³. Those characters make ultra-thin L1₀ FePd films suitable for use in nano-devices for magnetic applications.

Original language	English
Article number	113919
Journal	Journal of Applied Physics
Volume	112
Issue number	11
DOIs	https://doi.org/10.1063/1.4769737
Publication status	Published - 2012 Dec 1

Bibliographical note

Funding Information:
This research was supported in part by the industry-university cooperation project of the SK Hynix Semiconductor Inc., and by the Basic Science Research Program (2012-009406) and the Pioneer Research Center Program (2012-0001087) funded by the Ministry of Education, Science and Technology in Korea.

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

Access to Document

10.1063/1.4769737

Cite this

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title = "Effect of a change in thickness on the structural and perpendicular magnetic properties of L10 ordered FePd ultra-thin films with (001) texture",

abstract = "Ultra-thin FePd films were prepared by the sputter-deposition of Fe and Pd layers. After annealing at 500°C, they transformed to a (001) oriented L10 ordered phase from an A1 disordered phase and changed their anisotropy to perpendicular magnetic anisotropy from in-plane. The ordered parameter was about 0.7 for all thicknesses of the FePd films. The 20nm-thick FePd film exhibited the squareness of 0.3 because both the disordered phase with in-plane magnetic anisotropy and ordered phase with perpendicular magnetic anisotropy existed in the FePd film. The disordered phase was reduced, and the L10 phase became predominated as the thickness of the FePd films decreased. In particular, when the FePd films were 3 and 5nm thick, the squareness became unity while maintaining a thermal stability factor of over 60. The uniaxial magnetic anisotropy constant Ku was over 1×107erg/cm3. Those characters make ultra-thin L10 FePd films suitable for use in nano-devices for magnetic applications.",

author = "Jungho Ko and Taejin Bae and Jongill Hong",

note = "Funding Information: This research was supported in part by the industry-university cooperation project of the SK Hynix Semiconductor Inc., and by the Basic Science Research Program (2012-009406) and the Pioneer Research Center Program (2012-0001087) funded by the Ministry of Education, Science and Technology in Korea. ",

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AU - Hong, Jongill

N1 - Funding Information: This research was supported in part by the industry-university cooperation project of the SK Hynix Semiconductor Inc., and by the Basic Science Research Program (2012-009406) and the Pioneer Research Center Program (2012-0001087) funded by the Ministry of Education, Science and Technology in Korea.

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N2 - Ultra-thin FePd films were prepared by the sputter-deposition of Fe and Pd layers. After annealing at 500°C, they transformed to a (001) oriented L10 ordered phase from an A1 disordered phase and changed their anisotropy to perpendicular magnetic anisotropy from in-plane. The ordered parameter was about 0.7 for all thicknesses of the FePd films. The 20nm-thick FePd film exhibited the squareness of 0.3 because both the disordered phase with in-plane magnetic anisotropy and ordered phase with perpendicular magnetic anisotropy existed in the FePd film. The disordered phase was reduced, and the L10 phase became predominated as the thickness of the FePd films decreased. In particular, when the FePd films were 3 and 5nm thick, the squareness became unity while maintaining a thermal stability factor of over 60. The uniaxial magnetic anisotropy constant Ku was over 1×107erg/cm3. Those characters make ultra-thin L10 FePd films suitable for use in nano-devices for magnetic applications.

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