Magneto-optical properties of La0.7Sr0.3MnO 3 thin films with perpendicular magnetic anisotropy

Hsiang Lin Liu, K. S. Lu, M. X. Kuo, L. Uba, S. Uba, L. M. Wang, H. T. Jeng

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

We report the magneto-optical (MO) properties of compressively strained La0.7 Sr0.3 Mn O3 (LSMO) thin films epitaxially grown on a LaAl O3 substrate. The magnetic force microscope images show the stripe magnetic domains, characteristic of films with the perpendicular magnetic anisotropy (PMA). The optical reflectance and transmittance of the samples were measured over a broad energy range from the far infrared through the ultraviolet. To extract the optical constants of the films, we analyzed all of the layers of this thin-film structure using a Drude-Lorentz model. From the parameters obtained, we compute the optical constants, such as frequency-dependent optical conductivity and the diagonal components of the dielectric tensor. Moreover, the MO polar Kerr spectra of the samples were measured in an applied magnetic field of 1.5 T between 0.74 and 5.8 eV. The off-diagonal components of the dielectric tensor were then calculated by analyzing Kerr rotation, ellipticity, and the determined diagonal elements of the dielectric tensor. These functions yield information about the spin-dependent electronic structures of the LSMO thin films. We observed several MO-active transitions above 2 eV. These bands arise from the Mn-d (t2g) to Mn-d (eg) in the majority-spin channel and the onset of O-2p to Mn-d (eg) and O-2p to Mn-d (t2g) transitions in the minority-spin channel, in accord with the band-structure calculations. Most interestingly, their peak position and intensity are dependent on the film thickness, suggesting possible applications for tailoring MO responses in these PMA thin films.

Original languageEnglish
JournalJournal of Applied Physics
Volume99
Issue number4
DOIs
Publication statusPublished - 2006 Feb 15

Fingerprint

optical properties
anisotropy
tensors
thin films
ellipticity
minorities
magnetic domains
transmittance
film thickness
microscopes
electronic structure
reflectance
conductivity
magnetic fields
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Magneto-optical properties of La0.7Sr0.3MnO 3 thin films with perpendicular magnetic anisotropy. / Liu, Hsiang Lin; Lu, K. S.; Kuo, M. X.; Uba, L.; Uba, S.; Wang, L. M.; Jeng, H. T.

In: Journal of Applied Physics, Vol. 99, No. 4, 15.02.2006.

Research output: Contribution to journalArticle

Liu, Hsiang Lin ; Lu, K. S. ; Kuo, M. X. ; Uba, L. ; Uba, S. ; Wang, L. M. ; Jeng, H. T. / Magneto-optical properties of La0.7Sr0.3MnO 3 thin films with perpendicular magnetic anisotropy. In: Journal of Applied Physics. 2006 ; Vol. 99, No. 4.
@article{babe3341a1b446d99ef9ddce807c2fc2,
title = "Magneto-optical properties of La0.7Sr0.3MnO 3 thin films with perpendicular magnetic anisotropy",
abstract = "We report the magneto-optical (MO) properties of compressively strained La0.7 Sr0.3 Mn O3 (LSMO) thin films epitaxially grown on a LaAl O3 substrate. The magnetic force microscope images show the stripe magnetic domains, characteristic of films with the perpendicular magnetic anisotropy (PMA). The optical reflectance and transmittance of the samples were measured over a broad energy range from the far infrared through the ultraviolet. To extract the optical constants of the films, we analyzed all of the layers of this thin-film structure using a Drude-Lorentz model. From the parameters obtained, we compute the optical constants, such as frequency-dependent optical conductivity and the diagonal components of the dielectric tensor. Moreover, the MO polar Kerr spectra of the samples were measured in an applied magnetic field of 1.5 T between 0.74 and 5.8 eV. The off-diagonal components of the dielectric tensor were then calculated by analyzing Kerr rotation, ellipticity, and the determined diagonal elements of the dielectric tensor. These functions yield information about the spin-dependent electronic structures of the LSMO thin films. We observed several MO-active transitions above 2 eV. These bands arise from the Mn-d (t2g) to Mn-d (eg) in the majority-spin channel and the onset of O-2p to Mn-d (eg) and O-2p to Mn-d (t2g) transitions in the minority-spin channel, in accord with the band-structure calculations. Most interestingly, their peak position and intensity are dependent on the film thickness, suggesting possible applications for tailoring MO responses in these PMA thin films.",
author = "Liu, {Hsiang Lin} and Lu, {K. S.} and Kuo, {M. X.} and L. Uba and S. Uba and Wang, {L. M.} and Jeng, {H. T.}",
year = "2006",
month = "2",
day = "15",
doi = "10.1063/1.2173681",
language = "English",
volume = "99",
journal = "Journal of Applied Physics",
issn = "0021-8979",
publisher = "American Institute of Physics Publising LLC",
number = "4",

}

TY - JOUR

T1 - Magneto-optical properties of La0.7Sr0.3MnO 3 thin films with perpendicular magnetic anisotropy

AU - Liu, Hsiang Lin

AU - Lu, K. S.

AU - Kuo, M. X.

AU - Uba, L.

AU - Uba, S.

AU - Wang, L. M.

AU - Jeng, H. T.

PY - 2006/2/15

Y1 - 2006/2/15

N2 - We report the magneto-optical (MO) properties of compressively strained La0.7 Sr0.3 Mn O3 (LSMO) thin films epitaxially grown on a LaAl O3 substrate. The magnetic force microscope images show the stripe magnetic domains, characteristic of films with the perpendicular magnetic anisotropy (PMA). The optical reflectance and transmittance of the samples were measured over a broad energy range from the far infrared through the ultraviolet. To extract the optical constants of the films, we analyzed all of the layers of this thin-film structure using a Drude-Lorentz model. From the parameters obtained, we compute the optical constants, such as frequency-dependent optical conductivity and the diagonal components of the dielectric tensor. Moreover, the MO polar Kerr spectra of the samples were measured in an applied magnetic field of 1.5 T between 0.74 and 5.8 eV. The off-diagonal components of the dielectric tensor were then calculated by analyzing Kerr rotation, ellipticity, and the determined diagonal elements of the dielectric tensor. These functions yield information about the spin-dependent electronic structures of the LSMO thin films. We observed several MO-active transitions above 2 eV. These bands arise from the Mn-d (t2g) to Mn-d (eg) in the majority-spin channel and the onset of O-2p to Mn-d (eg) and O-2p to Mn-d (t2g) transitions in the minority-spin channel, in accord with the band-structure calculations. Most interestingly, their peak position and intensity are dependent on the film thickness, suggesting possible applications for tailoring MO responses in these PMA thin films.

AB - We report the magneto-optical (MO) properties of compressively strained La0.7 Sr0.3 Mn O3 (LSMO) thin films epitaxially grown on a LaAl O3 substrate. The magnetic force microscope images show the stripe magnetic domains, characteristic of films with the perpendicular magnetic anisotropy (PMA). The optical reflectance and transmittance of the samples were measured over a broad energy range from the far infrared through the ultraviolet. To extract the optical constants of the films, we analyzed all of the layers of this thin-film structure using a Drude-Lorentz model. From the parameters obtained, we compute the optical constants, such as frequency-dependent optical conductivity and the diagonal components of the dielectric tensor. Moreover, the MO polar Kerr spectra of the samples were measured in an applied magnetic field of 1.5 T between 0.74 and 5.8 eV. The off-diagonal components of the dielectric tensor were then calculated by analyzing Kerr rotation, ellipticity, and the determined diagonal elements of the dielectric tensor. These functions yield information about the spin-dependent electronic structures of the LSMO thin films. We observed several MO-active transitions above 2 eV. These bands arise from the Mn-d (t2g) to Mn-d (eg) in the majority-spin channel and the onset of O-2p to Mn-d (eg) and O-2p to Mn-d (t2g) transitions in the minority-spin channel, in accord with the band-structure calculations. Most interestingly, their peak position and intensity are dependent on the film thickness, suggesting possible applications for tailoring MO responses in these PMA thin films.

UR - http://www.scopus.com/inward/record.url?scp=33644611821&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33644611821&partnerID=8YFLogxK

U2 - 10.1063/1.2173681

DO - 10.1063/1.2173681

M3 - Article

AN - SCOPUS:33644611821

VL - 99

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

IS - 4

ER -