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Title: Microstructure and magnetic properties of (001) textured L1(0) FePt films on amorphous glass substrate

Abstract

L1(0) FePt thin films with an island-like morphology and magnetic perpendicular anisotropy were grown at low temperature (300 < T-dep< 375 degrees C) by magnetron sputtering on Hoya glass substrates using a 30-nm thick Cr (2 0 0) underlayer. An MgO buffer layer with a thickness of 2 nm was used to inhibit the diffusion from the Cr underlayer and promote the growth of (0 0 1) oriented L1(0) FePt films by inducing an in-plane lattice distortion. By varying the substrate temperature and the Ar sputter pressure (3.5 < P-Ar< 15 mTorr) during the deposition, the degree of chemical order, the microstructure and the magnetic properties were tuned and the best properties in term of squareness ratio (M-r/M-s similar to 0.95) and coercive field (H-c similar to 14 kOe) were observed for films deposited at T-dep = 350 degrees C and P-Ar= 5 mTorr, due to the appearance of a tensile strain, which favors the perpendicular anisotropy. The analysis of the angular dependence of remanent magnetization curves on the optimized sample suggests that the magnetization reversal is highly incoherent due to the inter-island interactions. Our results provide useful information on the low temperature growth of FePt films with perpendicular anisotropymore » onto glass substrates, which are relevant for a variety of technological applications, such as magnetic recording and spintronic devices. (C) 2015 Elsevier B.V. All rights reserved.« less

Authors:
; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
OSTI Identifier:
1211011
Resource Type:
Journal Article
Journal Name:
Applied Surface Science
Additional Journal Information:
Journal Volume: 337; Journal ID: ISSN 0169-4332
Country of Publication:
United States
Language:
English

Citation Formats

Speliotis, T, Varvaro, G, Testa, AM, Giannopoulos, G, Agostinelli, E, Li, W, Hadjipanayis, G, and Niarchos, D. Microstructure and magnetic properties of (001) textured L1(0) FePt films on amorphous glass substrate. United States: N. p., 2015. Web. doi:10.1016/j.apsusc.2015.02.073.
Speliotis, T, Varvaro, G, Testa, AM, Giannopoulos, G, Agostinelli, E, Li, W, Hadjipanayis, G, & Niarchos, D. Microstructure and magnetic properties of (001) textured L1(0) FePt films on amorphous glass substrate. United States. doi:10.1016/j.apsusc.2015.02.073.
Speliotis, T, Varvaro, G, Testa, AM, Giannopoulos, G, Agostinelli, E, Li, W, Hadjipanayis, G, and Niarchos, D. Fri . "Microstructure and magnetic properties of (001) textured L1(0) FePt films on amorphous glass substrate". United States. doi:10.1016/j.apsusc.2015.02.073.
@article{osti_1211011,
title = {Microstructure and magnetic properties of (001) textured L1(0) FePt films on amorphous glass substrate},
author = {Speliotis, T and Varvaro, G and Testa, AM and Giannopoulos, G and Agostinelli, E and Li, W and Hadjipanayis, G and Niarchos, D},
abstractNote = {L1(0) FePt thin films with an island-like morphology and magnetic perpendicular anisotropy were grown at low temperature (300 < T-dep< 375 degrees C) by magnetron sputtering on Hoya glass substrates using a 30-nm thick Cr (2 0 0) underlayer. An MgO buffer layer with a thickness of 2 nm was used to inhibit the diffusion from the Cr underlayer and promote the growth of (0 0 1) oriented L1(0) FePt films by inducing an in-plane lattice distortion. By varying the substrate temperature and the Ar sputter pressure (3.5 < P-Ar< 15 mTorr) during the deposition, the degree of chemical order, the microstructure and the magnetic properties were tuned and the best properties in term of squareness ratio (M-r/M-s similar to 0.95) and coercive field (H-c similar to 14 kOe) were observed for films deposited at T-dep = 350 degrees C and P-Ar= 5 mTorr, due to the appearance of a tensile strain, which favors the perpendicular anisotropy. The analysis of the angular dependence of remanent magnetization curves on the optimized sample suggests that the magnetization reversal is highly incoherent due to the inter-island interactions. Our results provide useful information on the low temperature growth of FePt films with perpendicular anisotropy onto glass substrates, which are relevant for a variety of technological applications, such as magnetic recording and spintronic devices. (C) 2015 Elsevier B.V. All rights reserved.},
doi = {10.1016/j.apsusc.2015.02.073},
journal = {Applied Surface Science},
issn = {0169-4332},
number = ,
volume = 337,
place = {United States},
year = {2015},
month = {5}
}