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Takaobushi, Junichi; Ishikawa, M.; Ueda, Shigenori; Ikenaga, Eiji; Kim, Jung-Jin; Kobata, Masaaki; Takeda, Yukiharu; Saitoh, Y.; Yabashi, Makina; Nishino, Yoshinori; Miwa, D.; Tamasaku, Kenji; Ishikawa, Tetsuya; Satoh, Issei; Tanaka, Hidekazu; Kobayashi, Keisuke; Kawai, Tomoji

doi:10.1103/physrevb.76.205108

Cited by 88 publications

(53 citation statements)

References 25 publications

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“…30 If the photon energy is tuned to peak A ͑h = 708.5 eV͒, one can see a feature at E B ϳ 2 eV in the on-resonance spectrum ͓see Fig. 4͑c͔͒, indicating that the intensity of photoelectrons arising from Fe 2+ ions ͑the minority-spin state of Fe 2+ ions͒ 31 is enhanced. For the spectra excited by photon energies corresponding to peaks B ͑h = 709.7 eV͒ and C ͑h = 710.5 eV͒, one can see a broad structure around E B ϳ 3-8 eV ͓see Fig.…”

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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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%

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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“…This behavior is typical for Mn 2+ systems. 23,24 In summary, the development of the Mn 2p doublet provides clear evidence for the presence of Mn 2+ ions.…”

Section: A Structural and Chemical Characterizationsmentioning

confidence: 99%

“…XMCD studies have been previously reported for polycrystalline MnFe 2 O 4 powders 35 and nanocrystalline thick films of Mn x Fe 3−x O 4 (150-nm sputtered films 36 and 100-nm films obtained by pulsed laser deposition 24 ). Our experiments are thus the first ones on epitaxial MnFe 2 O 4 ultrathin films.…”

Section: Magnetic Properties and Cationic Distributionmentioning

confidence: 99%

“…This could verify the multivalence character of Mn ions, due to Mn 2+ (∼ 640 eV) and Mn 3+ (∼ 641 eV) ions, 25 often observed in manganite thin films. As many groups 24 have questioned the suitability of the Mn 2p signal for investigations of the Mn valence, we performed XAS and XMCD experiments to access more precisely the valence and the cationic sites' distribution in our MnFe 2 O 4 ultrathin films (see Sec. III C).…”

Section: A Structural and Chemical Characterizationsmentioning

confidence: 99%

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Epitaxial growth and ferrimagnetic behavior of MnFe2O4(111) ultrathin layers for room-temperature spin filtering

et al. 2011

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We report on the epitaxial growth and physical properties of spinel MnFe 2 O 4 (111) thin films with thicknesses down to 2 nm. The thin films, grown on α-Al 2 O 3 (0001) single crystals or Pt(111) buffer layers by oxygen-assisted molecular beam epitaxy, exhibit high structural order with sharp interfaces and low roughness. The electrical and magnetic properties are carefully investigated and it is shown that MnFe 2 O 4 (111) ultrathin films keep an insulating and ferrimagnetic behavior at room temperature. Special attention is given to the iron/manganese valence state and the cationic ordering. X-ray absorption spectroscopy and magnetic circular dichroism measurements reveal that thin films contain mainly Fe 3+ and Mn 2+ cations, distributed predominantly in a normal spinel structure. This study proves the high potential of MnFe 2 O 4 to be used as a magnetic tunnel barrier for spin filtering applications at room temperature.

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“…We also speculate that insulating FeTiO 3 is converted into semiconductor via this mechanism by the formation of FeTiO 3 -Fe 2 O 3 solid solution, and that the peak shift toward the lower binding energy in the valence band HX-PES spectra (Fig. 2) Fe 3+ Fe 3+ = Mn, Zn) spinel oxide, for which they have also attributed the peak shift to the variation in the electron correlation [7]. The shift of peak position seen in Fig.…”

Section: Resultsmentioning

confidence: 91%

Electronic Structure of Ilmenite and Ilmenite-Hematite Solid Solution Using Hard X-Ray Photoemission Spectroscopy

Matoba

Fujita

Murai

et al. 2014

J. Jpn. Soc. Powder Powder Metallurgy

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Electronic structures ofFe3−xMxO4(

Cited by 88 publications

References 25 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

Epitaxial growth and ferrimagnetic behavior of MnFe2O4(111) ultrathin layers for room-temperature spin filtering

Electronic Structure of Ilmenite and Ilmenite-Hematite Solid Solution Using Hard X-Ray Photoemission Spectroscopy

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