Surface effects and structural dependence of magneto-optical spectra

Ultrathin Co films and CoPtn alloys and multilayers

Miyoung Kim, Arthur J Freeman, Ruqian Wu

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

First-principles calculations of the optical conductivities and magneto-optical Kerr effects for bulk and thin films of Co and for CoPtn alloys (n = 1 and 3) and multilayer (n = 3) are carried out using the full potential linearized augmented plane wave method with the local spin density approximation. For fcc bulk Co, we obtain a negligible dependence of the polar Kerr rotation on the direction of magnetization. By contrast, the calculated Kerr spectra of CoPtn are found to be very sensitive to structural changes. For Co(001) and Co(111) ultrathin films, the surface effects cause a redshift for the high-energy peaks in the magneto-optic Kerr effect (MOKE) spectra, mainly due to band narrowing. Except for the free standing Co(001) monolayer, the profile of their MOKE spectra, however, is very close to that of bulk Co.

Original languageEnglish
Pages (from-to)9432-9436
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume59
Issue number14
Publication statusPublished - Apr 1 1999

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Magnetooptical effects
Kerr effects
optical spectrum
Multilayers
magneto-optics
Optical Kerr effect
Optical conductivity
Ultrathin films
Monolayers
Magnetization
Thin films
plane waves
conductivity
magnetization
causes
thin films
profiles
approximation
energy
Direction compound

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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N2 - First-principles calculations of the optical conductivities and magneto-optical Kerr effects for bulk and thin films of Co and for CoPtn alloys (n = 1 and 3) and multilayer (n = 3) are carried out using the full potential linearized augmented plane wave method with the local spin density approximation. For fcc bulk Co, we obtain a negligible dependence of the polar Kerr rotation on the direction of magnetization. By contrast, the calculated Kerr spectra of CoPtn are found to be very sensitive to structural changes. For Co(001) and Co(111) ultrathin films, the surface effects cause a redshift for the high-energy peaks in the magneto-optic Kerr effect (MOKE) spectra, mainly due to band narrowing. Except for the free standing Co(001) monolayer, the profile of their MOKE spectra, however, is very close to that of bulk Co.

AB - First-principles calculations of the optical conductivities and magneto-optical Kerr effects for bulk and thin films of Co and for CoPtn alloys (n = 1 and 3) and multilayer (n = 3) are carried out using the full potential linearized augmented plane wave method with the local spin density approximation. For fcc bulk Co, we obtain a negligible dependence of the polar Kerr rotation on the direction of magnetization. By contrast, the calculated Kerr spectra of CoPtn are found to be very sensitive to structural changes. For Co(001) and Co(111) ultrathin films, the surface effects cause a redshift for the high-energy peaks in the magneto-optic Kerr effect (MOKE) spectra, mainly due to band narrowing. Except for the free standing Co(001) monolayer, the profile of their MOKE spectra, however, is very close to that of bulk Co.

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