Change in Superparamagnetic State Induced by Swift Heavy Ion Irradiation in Nano-Maghemite

Author:

Stichleutner Sándor1,Herczeg Bence1,Pechoušek Jiří2ORCID,Machala Libor2ORCID,Homonnay Zoltán1,Smrčka David2,Kouřil Lukáš2ORCID,Vondrášek René2,Kudor Mátyás1,Skuratov Vladimir A.345ORCID,Krupa Luboš23,Kubuki Shiro6ORCID,Kuzmann Ernő1ORCID

Affiliation:

1. Institute of Chemistry, Eötvös Loránd University, Pázmány P. s. 1/A, 1117 Budapest, Hungary

2. Department of Experimental Physics, Faculty of Science, Palacký University Olomouc, 17. listopadu 1192/12, 77146 Olomouc, Czech Republic

3. Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, JINR, Joliot-Curie 6, 141980 Dubna, Russia

4. Department of Nuclear Physics, Dubna State University, Universitetskaya 19, 141980 Dubna, Russia

5. Institute of Nuclear Physics and Engineering, National Research Nuclear University MEPhI, Kashirskoye Sh. 31, 115409 Moscow, Russia

6. Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, 1-1, Minami-Osawa, Hachi-Oji, Tokyo 192-0397, Japan

Abstract

The effect of swift heavy ion irradiation on sol–gel-prepared maghemite nanoparticles was studied by 57Fe transmission Mössbauer spectroscopy and X-ray diffractometry (XRD). The room temperature Mössbauer spectra of the non-irradiated nano-maghemite showed poorly resolved magnetically split, typical relaxation spectra due to the superparamagnetic state of the nanoparticles. Significant changes in the line shape, indicating changes in the superparamagnetic state, were found in the Mössbauer spectra upon irradiation by 160 MeV and 155 MeV 132Xe26+ ions with fluences of 5 × 1013 ion cm−2 and 1 × 1014 ion cm−2. XRD of the irradiated maghemite nanoparticles showed a significant broadening of the corresponding lines, indicating a decrease in the crystallite size, compared to those of the non-irradiated ones. The results are discussed in terms of the defects induced by irradiation and the corresponding changes related to the change in particle size and consequently in the superparamagnetic state caused by irradiation.

Funder

Hungarian National Research, Development and Innovation Office

Czech–Hungarian Intergovernmental Fund

Palacký University

the Ministry of Education, Youth & Sports of the Czech Republic

Publisher

MDPI AG

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