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Title: Effect of Growth Temperature on the Magnetic, Microwave, and Cation Inversion Properties on NiFe2O4 Thin Films Deposited by Pulsed Laser Ablation Deposition

Abstract

First principles band structure calculations suggest that the preferential occupation of Ni{sup 2+} ions on the tetrahedral sites in NiFe{sub 2}O{sub 4} would lead to an enhancement of the exchange integral and subsequently the Neel temperature and magnetization. To this end, we have deposited NiFe{sub 2}O{sub 4} films on MgO substrates by pulsed laser deposition. The substrate temperature was varied from 700 to 900 {sup o}C at 5 mTorr of O2 pressure. The films were annealed at 1000 {sup o}C for different times prior to their characterization. X-ray diffraction spectra showed either (100) or (111) orientation with the spinel structure dependent on the substrate orientation. Magnetic studies showed a magnetization value of 2.7 kG at 300 K. The magnetic moment was increased to the bulk value as a result of postdeposition annealing at 1000 {sup o}C. The as produced films show that the ferromagnetic resonance linewidth at 9.61 GHz was 1.5 kOe, and it was reduced to 0.34 kOe after postannealing at 1000 {sup o}C. This suggests that the annealing led to the redistribution of Ni{sup 2+} ions to their equilibrium octahedral sites. Further, it is shown that the magnetically preferred direction of H{sub a} can be aligned perpendicular tomore » the film plane when films are grown with a fixed oxygen pressure of 5 mTorr for films deposited at 700 and 900 {sup o}C.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
930513
Report Number(s):
BNL-80483-2008-JA
Journal ID: ISSN 0021-8979; JAPIAU; TRN: US200904%%567
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 101
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; NICKEL OXIDES; IRON OXIDES; DEPOSITION; SUBSTRATES; MAGNESIUM OXIDES; TEMPERATURE DEPENDENCE; MAGNETIZATION; MAGNETIC MOMENTS; ELECTRONIC STRUCTURE; national synchrotron light source

Citation Formats

Chinnasamy,C., Yoon, S., Yang, A., Baraskar, A., Vittoria, C., and Harris, V. Effect of Growth Temperature on the Magnetic, Microwave, and Cation Inversion Properties on NiFe2O4 Thin Films Deposited by Pulsed Laser Ablation Deposition. United States: N. p., 2007. Web. doi:10.1063/1.2714204.
Chinnasamy,C., Yoon, S., Yang, A., Baraskar, A., Vittoria, C., & Harris, V. Effect of Growth Temperature on the Magnetic, Microwave, and Cation Inversion Properties on NiFe2O4 Thin Films Deposited by Pulsed Laser Ablation Deposition. United States. doi:10.1063/1.2714204.
Chinnasamy,C., Yoon, S., Yang, A., Baraskar, A., Vittoria, C., and Harris, V. Mon . "Effect of Growth Temperature on the Magnetic, Microwave, and Cation Inversion Properties on NiFe2O4 Thin Films Deposited by Pulsed Laser Ablation Deposition". United States. doi:10.1063/1.2714204.
@article{osti_930513,
title = {Effect of Growth Temperature on the Magnetic, Microwave, and Cation Inversion Properties on NiFe2O4 Thin Films Deposited by Pulsed Laser Ablation Deposition},
author = {Chinnasamy,C. and Yoon, S. and Yang, A. and Baraskar, A. and Vittoria, C. and Harris, V.},
abstractNote = {First principles band structure calculations suggest that the preferential occupation of Ni{sup 2+} ions on the tetrahedral sites in NiFe{sub 2}O{sub 4} would lead to an enhancement of the exchange integral and subsequently the Neel temperature and magnetization. To this end, we have deposited NiFe{sub 2}O{sub 4} films on MgO substrates by pulsed laser deposition. The substrate temperature was varied from 700 to 900 {sup o}C at 5 mTorr of O2 pressure. The films were annealed at 1000 {sup o}C for different times prior to their characterization. X-ray diffraction spectra showed either (100) or (111) orientation with the spinel structure dependent on the substrate orientation. Magnetic studies showed a magnetization value of 2.7 kG at 300 K. The magnetic moment was increased to the bulk value as a result of postdeposition annealing at 1000 {sup o}C. The as produced films show that the ferromagnetic resonance linewidth at 9.61 GHz was 1.5 kOe, and it was reduced to 0.34 kOe after postannealing at 1000 {sup o}C. This suggests that the annealing led to the redistribution of Ni{sup 2+} ions to their equilibrium octahedral sites. Further, it is shown that the magnetically preferred direction of H{sub a} can be aligned perpendicular to the film plane when films are grown with a fixed oxygen pressure of 5 mTorr for films deposited at 700 and 900 {sup o}C.},
doi = {10.1063/1.2714204},
journal = {Journal of Applied Physics},
number = ,
volume = 101,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}