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Tuning exchange-dominated spin-waves using lateral current spread in nanocontact spin-torque nano-oscillators
Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden..
KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.ORCID iD: 0000-0003-4253-357X
Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden..
Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden..
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2019 (English)In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 492, article id UNSP 165503Article in journal (Refereed) Published
Abstract [en]

We present an efficient method to tailor propagating spin waves in quasi-confined systems. We use nanocontact spin-torque nano-oscillators based on NiFe/Cu/Co spin-valves and study the ferromagnetic and spin-wave resonances (FMR and SWR) of both layers. We employ homodyne-detected ferromagnetic resonance spectroscopy, resembling spin-torque FMR, to detect the magnetodynamics. The external field is applied in-plane, giving a parallel configuration of the magnetic layers, which do not provide any spin-transfer torque. Instead, the excitation is caused by the Oersted field. By varying the thickness of the bottom Cu electrode (t(Cu)) of the devices, we tune the current distribution in the samples, and thereby the Oersted field, which governs the spin wave characteristics. Both the average k-vector and the bandwidth of the SWR increases as t(Cu) increases.

Place, publisher, year, edition, pages
ELSEVIER , 2019. Vol. 492, article id UNSP 165503
Keywords [en]
Spin-wave, Spin torque nano-oscillator, Ferromagnetic resonance
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URN: urn:nbn:se:kth:diva-260152DOI: 10.1016/j.jmmm.2019.165503ISI: 000483912600045OAI: oai:DiVA.org:kth-260152DiVA, id: diva2:1356240
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QC 20191001

Available from: 2019-10-01 Created: 2019-10-01 Last updated: 2019-10-01Bibliographically approved

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Banuazizi, S. Amir HosseinÅkerman, Johan

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