Change in Magnetic Anisotropy at the Surface and in the Bulk of FINEMET Induced by Swift Heavy Ion Irradiation

Ernő Kuzmann; Sándor Stichleutner; Libor Machala; Jiří Pechoušek; René Vondrášek; David Smrčka; Lukáš Kouřil; Zoltán Homonnay; Michael I Oshtrakh; András Mozzolai; Vladimir A Skuratov; Mátyás Kudor; Bence Herczeg; Lajos Károly Varga

doi:10.3390/nano12121962

Change in Magnetic Anisotropy at the Surface and in the Bulk of FINEMET Induced by Swift Heavy Ion Irradiation

Nanomaterials (Basel). 2022 Jun 8;12(12):1962. doi: 10.3390/nano12121962.

Authors

Ernő Kuzmann¹, Sándor Stichleutner^{1

2}, Libor Machala³, Jiří Pechoušek³, René Vondrášek³, David Smrčka³, Lukáš Kouřil³, Zoltán Homonnay¹, Michael I Oshtrakh⁴, András Mozzolai¹, Vladimir A Skuratov^{5

6

7}, Mátyás Kudor¹, Bence Herczeg¹, Lajos Károly Varga⁸

Affiliations

¹ Institute of Chemistry, Eötvös Loránd University, Pázmány Péter Sétány 1/A, 1117 Budapest, Hungary.
² Centre for Energy Research, Konkoly-Thege Miklós út 29-33, 1121 Budapest, Hungary.
³ Department of Experimental Physics, Faculty of Science, Palacký University Olomouc, 17. listopadu 1192/12, 771 46 Olomouc, Czech Republic.
⁴ Department of Experimental Physics, Institute of Physics and Technology, Ural Federal University, 620002 Ekaterinburg, Russia.
⁵ Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, 141980 Dubna, Russia.
⁶ Institute of Nuclear Physics and Engineering, National Research Nuclear University MEPhI, 115409 Moscow, Russia.
⁷ Department of Nuclear Physics, Dubna State University, 141980 Dubna, Russia.
⁸ Wigner Research Centre for Physics, Konkoly-Thege Miklós út 29-33, 1121 Budapest, Hungary.

Abstract

⁵⁷Fe transmission and conversion electron Mössbauer spectroscopy as well as XRD were used to study the effect of swift heavy ion irradiation on stress-annealed FINEMET samples with a composition of Fe_73.5Si_13.5Nb₃B₉Cu₁. The XRD of the samples indicated changes neither in the crystal structure nor in the texture of irradiated ribbons as compared to those of non-irradiated ones. However, changes in the magnetic anisotropy both in the bulk as well as at the surface of the FINEMET alloy ribbons irradiated by 160 MeV ¹³²Xe ions with a fluence of 10¹³ ion cm^-2 were revealed via the decrease in relative areas of the second and fifth lines of the magnetic sextets in the corresponding Mössbauer spectra. The irradiation-induced change in the magnetic anisotropy in the bulk was found to be similar or somewhat higher than that at the surface. The results are discussed in terms of the defects produced by irradiation and corresponding changes in the orientation of spins depending on the direction of the stress generated around these defects.

Keywords: 57Fe transmission and conversion electron Mössbauer spectroscopy; FINEMET; magnetic anisotropy; swift heavy ion irradiation.

Abstract

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