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Measuring acoustic mode resonance alone as a sensitive technique to extract antiferromagnetic coupling strength
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. Uppsala Univ, Dept Engn Sci, S-75121 Uppsala, Sweden..
Univ Western Australia, Dept Phys, Crawley, WA 6009, Australia..
Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden..
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2015 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 92, no 6, 064418Article in journal (Refereed) Published
Abstract [en]

We have studied static and dynamic magnetic properties of a general asymmetric trilayer system using numerical simulations. For ferromagnetic, 90 degrees, and antiferromagnetic coupling, the magnetizations of the two magnetic layers exhibit one, two, and three phases with increasing external field, respectively. The total magnetization and ferromagnetic resonance accordingly follow these phases of the magnetization vectors. The resonance condition is related to the interlayer coupling strength in such a way that a larger coupling constant yields a higher value of f(res)/H, where f(res) is the resonance frequency at the external magnetic field H. Based on the simulation results, it is proposed that measurements of the acoustic mode resonance alone at unsaturated conditions provide a sensitive and accurate technique to extract the antiferromagnetic coupling strength. The technique is demonstrated experimentally with the broadband ferromagnetic resonance measurements of two trilayer films with weak and strong coupling strengths. The technique offers an efficient and sensitive method for antiferromagnetic coupling strength extraction, yielding coupling constant values with a precision of better than 0.03 erg/cm(2). Also, separation of the bilinear and biquadratic coupling contributions is possible with the technique.

Place, publisher, year, edition, pages
2015. Vol. 92, no 6, 064418
National Category
Physical Sciences Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-265930DOI: 10.1103/PhysRevB.92.064418ISI: 000362212200005OAI: oai:DiVA.org:uu-265930DiVA: diva2:866972
Funder
Knut and Alice Wallenberg FoundationSwedish Research Council
Available from: 2015-11-04 Created: 2015-11-04 Last updated: 2017-12-01Bibliographically approved

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Wei, YajunSvedlindh, Peter

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