Academic Journal
Interplay between microstructure and magnetism in NiO nanoparticles: breakdown of the antiferromagnetic order
| العنوان: | Interplay between microstructure and magnetism in NiO nanoparticles: breakdown of the antiferromagnetic order |
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| المؤلفون: | Rinaldi Montes, Natalia Magdalena, Gorría Korres, Pedro, Martínez Blanco, David, Fuertes Arias, Antonio Benito, Fernández Barquín, Luis, Rodríguez Fernández, Jesús, Pedro del Valle, Imanol de, Fernández Gubieda, M. L., Alonso, J., Olivi, Luca, Aquilanti, Giuliana, Blanco Rodríguez, Jesús Ángel |
| بيانات النشر: | The Royal Society of Chemistry |
| سنة النشر: | 2014 |
| المجموعة: | Universidad de Oviedo: RUO |
| الوصف: | The possibility of tuning the magnetic behaviour of nanostructured 3d transition metal oxides has opened up the path for extensive research activity in the nanoscale world. In this work we report on how the antiferromagnetism of a bulk material can be broken when reducing its size under a given threshold. We combined X-ray diffraction, high-resolution transmission electron microscopy, extended X-ray absorption fine structure and magnetic measurements in order to describe the influence of the microstructure and morphology on the magnetic behaviour of NiO nanoparticles (NPs) with sizes ranging from 2.5 to 9 nm. The present findings reveal that size effects induce surface spin frustration which competes with the expected antiferromagnetic (AFM) order, typical of bulk NiO, giving rise to a threshold size for the AFM phase to nucleate. Ni2+ magnetic moments in 2.5 nm NPs seem to be in a spin glass (SG) state, whereas larger NPs are formed by an uncompensated AFM core with a net magnetic moment surrounded by a SG shell. The coupling at the core–shell interface leads to an exchange bias effect manifested at low temperature as horizontal shifts of the hysteresis loop (∼1 kOe) and a coercivity enhancement (∼0.2 kOe). ; Ministerio de Educación, Cultura y Deporte (MECD) doctoral grant FPU12/03381. This work was accomplished with financial support from project MAT2011-27573-C04. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | Nanoscale, 6(1); MAT2011-27573-C04; http://dx.doi.org/10.1039/c3nr03961g; http://hdl.handle.net/10651/25359; http://pubs.rsc.org/en/content/articlehtml/2014/nr/c3nr03961g |
| DOI: | 10.1039/c3nr03961g |
| الاتاحة: | http://hdl.handle.net/10651/25359 http://pubs.rsc.org/en/content/articlehtml/2014/nr/c3nr03961g https://doi.org/10.1039/c3nr03961g |
| Rights: | © The Royal Society of Chemistry 2014 ; open access |
| رقم الانضمام: | edsbas.8073929C |
| قاعدة البيانات: | BASE |
| DOI: | 10.1039/c3nr03961g |
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