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A New Class of Materials for Magneto-Optical Applications: Transparent Amorphous Thin Films of Fe-B-Nb and Fe-B-Nb-Y Metallic Glassy Alloys
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Engineering Material Physics.ORCID iD: 0000-0003-2170-0076
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.ORCID iD: 0000-0002-7656-9733
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2014 (English)In: IEEE transactions on magnetics, ISSN 0018-9464, E-ISSN 1941-0069, Vol. 50, no 4, 4004005- p.Article in journal (Refereed) Published
Abstract [en]

Optically highly transparent, soft magnetic thin films (4-18 nm thick) of Fe-B-Nb- and Fe-B-Nb-Y-based glassy metal targets were grown on quartz substrates by pulsed laser deposition, and their optical and magneto-optical properties were investigated over the visible spectrum (400-700 nm). All the films found to be fully amorphous in structure were continuous with uniform thickness and surface morphology. Their optical transmittance in the range 50%-85% was found to be film thickness dependent over the entire visible regime. The Verdet constant (V) and Faraday rotation angle (theta(f)) for different films (similar to 4-18 nm) investigated as a function of wavelength (lambda) show considerably higher values for the films of Fe-B-Nb-Y alloy as compared with those for Fe-B-Nb films, e. g., the similar to 4 nm film of Fe-B-Nb-Y alloy exhibits V similar to 49 degrees/Oe cm and theta(f)similar to 26 degrees/mu m while it decreased to similar to 29.4 degrees/Oe and similar to 11.8 degrees/mu m, respectively, for the Fe-B-Nb alloy at lambda=611 nm. A linear relationship is found for the wavelength dependence of V and theta(f) for both alloy systems. To the best of our knowledge, these values are considerably higher than those reported for any other magneto-optic material. The films are found to be soft magnetic with a high saturation moment while their magnetic coercivity values increases with thinness of the films. The observed combination of optical and magneto-optical properties of this new class of amorphous metallic films makes them viable for multifunctional magneto-optical applications.

Place, publisher, year, edition, pages
2014. Vol. 50, no 4, 4004005- p.
Keyword [en]
Amorphous magnetic materials, Faraday rotation, pulsed laser deposition (PLD), soft magnetic thin films
National Category
Materials Engineering
URN: urn:nbn:se:kth:diva-155814DOI: 10.1109/TMAG.2013.2290584ISI: 000343032900058ScopusID: 2-s2.0-84957927416OAI: diva2:762991
21st Conference on Soft Magnetic Materials (SMM), SEP 01-04, 2013, Budapest, Hungary

QC 20141113

Available from: 2014-11-13 Created: 2014-11-13 Last updated: 2014-11-13Bibliographically approved

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Masood, AnsarTamaki, TakahikoStröm, ValterBorgenstam, AnnikaÅgren, JohnRao, K. Venkat
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