Magnetic properties of CoO nanoparticles

Flipse, Cfj Kees; Rouwelaar, C. B.; Groot, de Fmf

doi:10.1007/s100530050482

Cited by 31 publications

(14 citation statements)

References 12 publications

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“…27 The sizable contribution of the orbital moment to the magnetic moment is a distinct trend of nanoparticle systems. 35 They have reported that the enhancement of orbital magnetism is largely determined by the contribution of surface atoms and the larger spin-orbit coupling of the electrons at surface atoms in the nanoparticle can affect the magnetic ordering in the nanoparticles. 35 Figure 7͑a͒ shows the Fe 2p-3d XMCD spectra of the ZnO:Fe nanoparticles measured at various magnetic fields.…”

Section: Resultsmentioning

confidence: 99%

“…35 They have reported that the enhancement of orbital magnetism is largely determined by the contribution of surface atoms and the larger spin-orbit coupling of the electrons at surface atoms in the nanoparticle can affect the magnetic ordering in the nanoparticles. 35 Figure 7͑a͒ shows the Fe 2p-3d XMCD spectra of the ZnO:Fe nanoparticles measured at various magnetic fields. One can observe the XMCD intensity down to H ϳ 0.1 T, as shown in Figs.…”

Section: Resultsmentioning

confidence: 99%

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Electronic structure and magnetism of the diluted magnetic semiconductor Fe-doped ZnO nanoparticles

Kataoka

Kobayashi

Sakamoto

et al. 2010

Journal of Applied Physics

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Articles you may be interested inEvidence of a cluster glass-like behavior in Fe-doped ZnO nanoparticles J. Appl. Phys. 115, 17E123 (2014) We have studied the electronic structure of Fe-doped ZnO nanoparticles, which have been reported to show ferromagnetism at room temperature, by x-ray photoemission spectroscopy, resonant photoemission spectroscopy, x-ray absorption spectroscopy, and x-ray magnetic circular dichroism ͑XMCD͒. From the experimental and cluster-model calculation results, we find that Fe atoms are predominantly in the Fe 3+ ionic state with mixture of a small amount of Fe 2+ and that Fe 3+ ions are dominant in the surface region of the nanoparticles. It is shown that the room temperature ferromagnetism in the Fe-doped ZnO nanoparticles primarily originated from the antiferromagnetic coupling between unequal amounts of Fe 3+ ions occupying two sets of nonequivalent positions in the region of the XMCD probing depth of ϳ2 -3 nm.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Electronic structure and magnetism of the diluted magnetic semiconductor Fe-doped ZnO nanoparticles

Kataoka

Kobayashi

Sakamoto

et al. 2010

Journal of Applied Physics

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“…How the oxidation influences the magnetic properties is of crucial interest from a fundamental as well as applied point of view and has been studied intensively over the past decade. For example, enhanced orbital-to-spin magnetic moments were found for deposited, oxide covered Co nanoparticles due to uncompensated moments at the Co/CoO interface [7][8][9]. A large effective additional anisotropy was reported for similar Co core, CoO shell nanoparticles if embedded into an antiferromagnetic CoO matrix [10].…”

Section: Introductionmentioning

confidence: 99%

Oxidation-induced spin reorientation in Co adatoms and CoPd dimers on Ni/Cu(100)

et al. 2016

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Ultrasmall magnetic clusters and adatoms are of strong current interest because of their possible use in future technological applications. Here, we demonstrate that the magnetic coupling between the adsorbates and the substrate can be significantly changed through oxidation. The magnetic properties of Co adatoms and CoPd dimers deposited on a remanently magnetized Ni/Cu(100) substrate have been investigated by x-ray absorption and x-ray magnetic circular dichroism spectroscopy at the Co L 2,3 edges. Using spectral differences, pure and oxidized components are distinguished, and their respective magnetic moments are determined. The Co adatoms and the CoPd dimers are coupled ferromagnetically to the substrate, while their oxides, Co-O and CoPd-O, are coupled antiferromagnetically to the substrate. Along with the spin reorientation from the pure to the oxidized state, the magnetic moment of the adatom is highly reduced from Co to Co-O. In contrast, the magnetic moment of the dimer is of similar order for CoPd and CoPd-O.

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“…Such magnetism was really observed and attracted the attention of the researchers due to possible its practical use. During the last decades the results on NiO 3,4,5,6,7 , MnO 8 , Cr 2 O 3 4 , CoO 9,10,11 , Fe 2 O 3 4 , CuO 12 and ferritin 13,14,15 have been published. Large magnetic moments were found and phenomena peculiar, especially for antiferromagnets were observed, such as superparamagnetism and exchange bias.…”

Section: Introductionmentioning

confidence: 99%

Spontaneous ferromagnetic spin ordering at the surface ofLa2CuO4

et al. 2007

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Magnetic properties of high purity stoichiometric La2CuO4 nanoparticles are systematically investigated as a function of particle size. Ferromagnetic single-domain spin clusters are shown to spontaneously form at the surface of fine grains as well as paramagnetic defects. Hysteresis loops and thermomagnetic irreversibility are observed in a wide temperature range 5 − 350 K with the remnant moment and coercivity gradually decreasing with increasing temperature. Possible origins of the spontaneous surface ferromagnetic clusters and the relation of our data to the appearance of unusual magnetic phenomena and phase separation of doped cuprates are discussed.

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Magnetic properties of CoO nanoparticles

Cited by 31 publications

References 12 publications

Electronic structure and magnetism of the diluted magnetic semiconductor Fe-doped ZnO nanoparticles

Electronic structure and magnetism of the diluted magnetic semiconductor Fe-doped ZnO nanoparticles

Oxidation-induced spin reorientation in Co adatoms and CoPd dimers on Ni/Cu(100)

Spontaneous ferromagnetic spin ordering at the surface ofLa2CuO4

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