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Microwave absorption in a thin La0.7Sr0.3MnO3 film: Manifestation of colossal magnetoresistance
KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.ORCID iD: 0000-0001-8774-9302
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2004 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 69, no 10Article in journal (Refereed) Published
Abstract [en]

Microwave (MW) absorption by a thin La0.7Sr0.3MnO3 film on a SrTiO3 substrate is investigated at a 9.1 GHz as a function of a dc magnetic field. Features of this absorption, namely, the jump in the absorption derivative, have been detected as the applied field passes through its zero value. Hysteretic behavior of the jumps is also observed. The results are discussed based on the model in which MW losses, additional to the ferromagnetic resonance, arise due to attenuation of MW currents induced in the sample by both variable magnetic induction and MW electrical field near the substrate surface with high dielectric permittivity. We show that zero-field anomalies in MW absorption are directly coupled with manganite magnetoresistive properties.

Place, publisher, year, edition, pages
2004. Vol. 69, no 10
Keyword [en]
ferromagnetic-resonance, manganites, temperature, transition, surface, powders
National Category
Condensed Matter Physics
URN: urn:nbn:se:kth:diva-23328DOI: 10.1103/PhysRevB.69.100409ISI: 000220813500012ScopusID: 2-s2.0-2342422999OAI: diva2:342026
QC 20100525 QC 20111027Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2011-10-27Bibliographically approved

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Khartsev, SergiyGrishin, Alexander M.
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