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Determination of magnetic anisotropy constants for magnetic garnet epitaxial films using ferromagnetic resonance
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.ORCID iD: 0000-0001-8774-9302
2005 (English)In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 288, 15-21 p.Article in journal (Refereed) Published
Abstract [en]

The constants of magnetocrystalline anisotropy K-l and uniaxial anisotropy K-u are determined precisely by using ferromagnetic resonance (FMR) and a fitting procedure oil a (1 1 1) yttrium iron garnet (YIG) film made by pulsed laser deposition (PLD) technique. By applying a magnetic field in the azimuthal orientation we introduce measurement in a geometry which yields the anisotropy constants with a high accuracy. The new technique is compared with the previous analysis employing characteristic plane measurements. The new geometry yields at least 15% better accuracy in determining constant K, than by the previous method with FMR.

Place, publisher, year, edition, pages
2005. Vol. 288, 15-21 p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-6465DOI: 10.1016/j.jmmm.2004.07.019ISI: 000227480800002Scopus ID: 2-s2.0-13544259556OAI: oai:DiVA.org:kth-6465DiVA: diva2:11186
Note
QC 20111108. Updated from in Press to PublishedAvailable from: 2004-11-12 Created: 2004-11-12 Last updated: 2017-12-14Bibliographically approved
In thesis
1. On ferromagnetic thin films and two-dimensional magneto-optic photonic crystals
Open this publication in new window or tab >>On ferromagnetic thin films and two-dimensional magneto-optic photonic crystals
2004 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis presents results in two different neighboring areas of research: the magnetic properties of thin ferrite films and the application of the films in two-dimensional photonic crystals.

In the first part, we investigate the accuracy of the customary method for determining the magnetic anisotropy constants of ferrite films by ferromagnetic resonance (FMR) experiment. We have improved the method and introduced an experimental procedure to obtain the anisotropy constants with higher precision. The magnetic anisotropy fields are obtained by using FMR on a (111)-oriented yttrium iron garnet (YIG) film made by pulsed laser deposition. Moreover, we found experimentally that the shapes of FMR spectra of laser deposited epitaxial YIG films strongly depend on the orientation of the magnetic bias field with respect to the crystalline axes of the film. Inhomogeneities of the constants of anisotropy throughout the film could be responsible for the complexity of the FMR spectra. We find the special directions of the applied magnetic field in which the contribution of the magnetocrystalline anisotropy has the smallest effect on the ferromagnetic resonance and therefore on the elements of the permeability tensor.

In the second part, we study the electromagnetic wave propagation in two-dimensional (2D) dielectric and magneto-optic photonic crystals (PCs). We have proposed a 2D PC which is composed of magneto-optic material for the purpose of the enhancement of Faraday rotation in high transmission. It is assumed that the 2D PC contains a bismuth iron garnet (BIG) film either as the PC background medium or as a defect, embedded in the 2D PC. We have examined theoretically and computationally the increase in the Faraday rotation as well as the transmission of a plane-polarized plane wave incident onto these structures in the optical wavelength regime. Several important phenomena, with potential applications, are observed.

Place, publisher, year, edition, pages
Kista: Mikroelektronik och informationsteknik, 2004
Series
TRITA-MVT, ISSN 0348-4467 ; 2004:6
Keyword
Physics, photonic crystals, physics, Fysik
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-42 (URN)
Public defence
2004-11-12, C1, Electrum, Kista, 13:00
Opponent
Supervisors
Available from: 2004-11-12 Created: 2004-11-12 Last updated: 2016-11-24

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Khartsev, Sergiy

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