The spin-spin correlations in hollow (H) and full (F) maghemite nanoparticles (NPs) have been studied by X-ray magnetic circular dichroism (XMCD). An unexpected XMCD signal was detected and analyzed under the application of a small field (μ0H = 160 Oe) and at remanence for both F and H NPs. Clear differences in the magnitude and in the lineshape of the XMCD spectra between F and H NPs emerged. By comparing XMCD measurements performed with a variable degree of surface sensitivity, we were able to address the specific role played by the surface spins in the magnetism of the NPs.
X-ray magnetic circular dichroism discloses surface spins correlation in maghemite hollow nanoparticles / V. Bonanni, M. Basini, D. Peddis, A. Lascialfari, G. Rossi, A. Piero Torelli. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - 112:2(2018 Jan 08), p. 022404.022404. [10.1063/1.5006153]
X-ray magnetic circular dichroism discloses surface spins correlation in maghemite hollow nanoparticles
V. Bonanni
Primo
;M. Basini;A. Lascialfari;G. Rossi;
2018
Abstract
The spin-spin correlations in hollow (H) and full (F) maghemite nanoparticles (NPs) have been studied by X-ray magnetic circular dichroism (XMCD). An unexpected XMCD signal was detected and analyzed under the application of a small field (μ0H = 160 Oe) and at remanence for both F and H NPs. Clear differences in the magnitude and in the lineshape of the XMCD spectra between F and H NPs emerged. By comparing XMCD measurements performed with a variable degree of surface sensitivity, we were able to address the specific role played by the surface spins in the magnetism of the NPs.
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