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Fan J, Menéndez E, Guerrero M, et al. Unraveling the Origin of Magnetism in Mesoporous Cu-Doped SnO₂ Magnetic Semiconductors. Nanomaterials (Basel). 2017;7(11)doi: 10.3390/nano7110348.
Fan, J., Menéndez, E., Guerrero, M., Quintana, A., Weschke, E., Pellicer, E., & Sort, J. (2017). Unraveling the Origin of Magnetism in Mesoporous Cu-Doped SnO₂ Magnetic Semiconductors. Nanomaterials (Basel, Switzerland), 7(11), . https://doi.org/10.3390/nano7110348
Fan, Junpeng, et al. "Unraveling the Origin of Magnetism in Mesoporous Cu-Doped SnO₂ Magnetic Semiconductors." Nanomaterials (Basel, Switzerland) vol. 7,11 (2017). doi: https://doi.org/10.3390/nano7110348
Fan J, Menéndez E, Guerrero M, Quintana A, Weschke E, Pellicer E, Sort J. Unraveling the Origin of Magnetism in Mesoporous Cu-Doped SnO₂ Magnetic Semiconductors. Nanomaterials (Basel). 2017 Oct 25;7(11). doi: 10.3390/nano7110348. PMID: 29068367; PMCID: PMC5707565.
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Nanomaterials (Basel). 2017 Oct 25;7(11). doi: 10.3390/nano7110348.

Unraveling the Origin of Magnetism in Mesoporous Cu-Doped SnO₂ Magnetic Semiconductors.

Nanomaterials (Basel, Switzerland)

Junpeng Fan, Enric Menéndez, Miguel Guerrero, Alberto Quintana, Eugen Weschke, Eva Pellicer, Jordi Sort

Affiliations

  1. Departament de Física, UniversitatAutònoma de Barcelona, E-08193 Cerdanyola del Vallès, Spain. [email protected].
  2. Departament de Física, UniversitatAutònoma de Barcelona, E-08193 Cerdanyola del Vallès, Spain. [email protected].
  3. Departament de Física, UniversitatAutònoma de Barcelona, E-08193 Cerdanyola del Vallès, Spain. [email protected].
  4. Departament de Física, UniversitatAutònoma de Barcelona, E-08193 Cerdanyola del Vallès, Spain. [email protected].
  5. Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489 Berlin, Germany. [email protected].
  6. Departament de Física, UniversitatAutònoma de Barcelona, E-08193 Cerdanyola del Vallès, Spain. [email protected].
  7. Departament de Física, UniversitatAutònoma de Barcelona, E-08193 Cerdanyola del Vallès, Spain. [email protected].
  8. Institució Catalana de Recerca i Estudis Avançats (ICREA), Pg. Lluís Companys 23, 08010 Barcelona, Spain. [email protected].

PMID: 29068367 PMCID: PMC5707565 DOI: 10.3390/nano7110348

Abstract

The origin of magnetism in wide-gap semiconductors doped with non-ferromagnetic 3d transition metals still remains intriguing. In this article, insights in the magnetic properties of ordered mesoporous Cu-doped SnO₂ powders, prepared by hard-templating, have been unraveled. Whereas, both oxygen vacancies and Fe-based impurity phases could be a plausible explanation for the observed room temperature ferromagnetism, the low temperature magnetism is mainly and unambiguously arising from the nanoscale nature of the formed antiferromagnetic CuO, which results in a net magnetization that is reminiscent of ferromagnetic behavior. This is ascribed to uncompensated spins and shape-mediated spin canting effects. The reduced blocking temperature, which resides between 30 and 5 K, and traces of vertical shifts in the hysteresis loops confirm size effects in CuO. The mesoporous nature of the system with a large surface-to-volume ratio likely promotes the occurrence of uncompensated spins, spin canting, and spin frustration, offering new prospects in the use of magnetic semiconductors for energy-efficient spintronics.

Keywords: diluted magnetic semiconductors; mesoporous SnO2 particles; nanocasting

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