Robust antiferromagnetic coupling in hard-soft bi-magnetic core/shell nanoparticles

Nature Communications
Marta EstraderJosep Nogués

Abstract

The growing miniaturization demand of magnetic devices is fuelling the recent interest in bi-magnetic nanoparticles as ultimate small components. One of the main goals has been to reproduce practical magnetic properties observed so far in layered systems. In this context, although useful effects such as exchange bias or spring magnets have been demonstrated in core/shell nanoparticles, other interesting key properties for devices remain elusive. Here we show a robust antiferromagnetic (AFM) coupling in core/shell nanoparticles which, in turn, leads to the foremost elucidation of positive exchange bias in bi-magnetic hard-soft systems and the remarkable regulation of the resonance field and amplitude. The AFM coupling in iron oxide-manganese oxide based, soft/hard and hard/soft, core/shell nanoparticles is demonstrated by magnetometry, ferromagnetic resonance and X-ray magnetic circular dichroism. Monte Carlo simulations prove the consistency of the AFM coupling. This unique coupling could give rise to more advanced applications of bi-magnetic core/shell nanoparticles.

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Citations

Apr 14, 2016·Scientific Reports·Yurii P IvanovJürgen Kosel
Apr 16, 2015·Scientific Reports·Marianna VasilakakiJosep Nogués
Sep 27, 2016·Scientific Reports·Aidin LakTeresa Pellegrino
May 13, 2017·Nano Letters·Maowei Jiang, Xiaogang Peng
Mar 25, 2016·Chemistry : a European Journal·Ruth Otero-LorenzoVerónica Salgueiriño
Jun 15, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Lidia Rosado PiquerJorge Echeverría
Feb 17, 2015·Small·Véronica Gavrilov-IsaacValérie Cabuil
Apr 23, 2014·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Lluís YedraFrancesca Peiró
Jul 8, 2016·Nanoscale·Arnaud MayenceLennart Bergström
Feb 23, 2018·Scientific Reports·Samuel D OberdickSara A Majetich
Aug 15, 2014·Nanotechnology·Gabriel C LavoratoElin L Winkler
Feb 5, 2015·Angewandte Chemie·Alec KirkemindeShenqiang Ren
Nov 29, 2017·Ultramicroscopy·Pau TorruellaSònia Estradé
Mar 23, 2021·Scientific Reports·F G SilvaR Perzynski
Apr 16, 2021·Advanced Science·Aidin LakPhilipp Bender
May 18, 2021·ACS Applied Materials & Interfaces·Abdullah Al ShafeMourad Benamara
Feb 12, 2019·Journal of the American Chemical Society·Yahong ChaiLi Yao
Jul 16, 2014·Nano Letters·Alec Kirkeminde, Shenqiang Ren
Aug 31, 2018·Nano Letters·Pau TorruellaSònia Estradé

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