Effect of he+ ion irradiation on interface width in thin-film co/pt terahertz spintronic sources

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Abstract

In this work, we experimentally studied the structural modification of the interfaces in bilayer Co/Pt spintronic terahertz emitters under irradiation with He+ ions with a fluence of up to 1016 cm-2. Using the non-destructive method of small-angle X-ray reflectometry, an increase in the Co/Pt interface width from 1.2 nm (initial sample) to 1.9 nm under irradiation with He+ with a fluence of 1016 cm-2 was detected. The experimental data are in good agreement with the results of modeling using SRIM. The magneto-optical measurements showed that the samples retain their magnetic properties at all fluences. The results can be used to increase the efficiency of terahertz generation in such structures.

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About the authors

I. A. Antonov

Institute for Physics of Microstructures, Russian Academy of Sciences; N.I. Lobachevsky State University of Nizhny Novgorod

Author for correspondence.
Email: ivan.antonov@sci-phys.ru
Russian Federation, Afonino, Nizhny Novgorod region; Nizhny Novgorod

R. V. Gorev

Institute for Physics of Microstructures, Russian Academy of Sciences

Email: ivan.antonov@sci-phys.ru
Russian Federation, Afonino, Nizhny Novgorod region; Nizhny Novgorod

Yu. A. Dudin

N.I. Lobachevsky State University of Nizhny Novgorod

Email: ivan.antonov@sci-phys.ru
Russian Federation, Nizhny Novgorod

E. A. Karashtin

Institute for Physics of Microstructures, Russian Academy of Sciences

Email: ivan.antonov@sci-phys.ru
Russian Federation, Afonino, Nizhny Novgorod region

D. S. Korolev

N.I. Lobachevsky State University of Nizhny Novgorod

Email: ivan.antonov@sci-phys.ru
Russian Federation, Nizhny Novgorod

I. Yu. Pashenkin

Institute for Physics of Microstructures, Russian Academy of Sciences

Email: ivan.antonov@sci-phys.ru
Russian Federation, Afonino, Nizhny Novgorod region

M. V. Sapozhnikov

Institute for Physics of Microstructures, Russian Academy of Sciences; N.I. Lobachevsky State University of Nizhny Novgorod

Email: ivan.antonov@sci-phys.ru
Russian Federation, Afonino, Nizhny Novgorod region; Nizhny Novgorod

P. A. Yunin

Institute for Physics of Microstructures, Russian Academy of Sciences; N.I. Lobachevsky State University of Nizhny Novgorod

Email: ivan.antonov@sci-phys.ru
Russian Federation, Afonino, Nizhny Novgorod region; Nizhny Novgorod

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Supplementary files

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2. Fig. 1. Experimental and simulated SAXS curves for the unirradiated Co/Pt bilayer structure (a); arrangement of layers in the Co/Pt structure and density profiles obtained from SAXS data (b).

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3. Fig. 2. The distribution of Co and Pt atoms, displaced under ion irradiation at a He ion fluence of 1016 cm-2 (a), simulated in the SRIM software package; a fragment of the density profiles at the Pt/Co interface for He ion fluences of 1014 and 1016 cm-2, determined from SRIM calculations (b).

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4. Fig. 3. Dependence of the angle of rotation of the plane of polarization on the applied magnetic field during reflection of light from the original Co/Pt structure (a) and the structure irradiated with He+ ions with a fluence of 1016 cm-2 (b).

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