Room temperature ferromagnetism in Fe-doped CeO2 thin films grown on LaAlO3 (001)

Sharma, S. K.; Thakur, P.; Kumar, Shalendra; Shukla, D. K.; Brookes, N. B.; Lee, C.G.; Pirota, K. R.; Koo, Bon Heun; Knobel, M.

doi:10.1016/j.tsf.2010.08.096

Cited by 36 publications

(15 citation statements)

References 24 publications

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“…The observed ferromagnetism can be explained in the light of F-center exchange coupling (FCE) [20]. The weak ferromagnetism observed in Ce 1Àx Mn x O 2 (0.0 x 0.10) nanoparticles is similar to the earlier reported results [9][10][11][12]15]. …”

Section: Resultssupporting

confidence: 87%

“…They found that 4% Ni doped CeO 2 sample exhibits a maximum value of saturation magnetization $1.21m emu/g and coercive field in the 40-120 Oe range. Previously, we have also reported weak ferromagnetism in TM (Fe, Co, Ni) doped CeO 2 nanoparticles [9][10][11]17]. Furthermore, we can say that the observed ferromagnetism in Ce 1Àx Mn x O 2 (0.0 x 0.10) nanoparticles may be intrinsic because it is very easy to rule out any impurity cause for the magnetic signal in Ce 1Àx Mn x O 2 (0.0 x 0.10) nanoparticles.…”

Section: Resultsmentioning

confidence: 64%

“…After the theoretical prediction of room temperature ferromagnetism (RT-FM) in wide band gap based semiconductors, dilute magnetic semiconductors (DMSs) have attracted considerable attention of scientific community due to their potential technological applications in spintronics devices, where the spin of the electron is exploited to offer the new functionalities [6,7]. Moreover, Ferromagnetism (FM) has been reported in various pure and transition metal (TM) doped wide band gap semiconductors such as ZnO, TiO 2 , SnO 2 , In 2 O 3 , and CeO 2 [8][9][10][11][12]. However, various studies performed on these systems have led to a controversy on the origin (intrinsic or extrinsic) of FM in these systems.…”

Section: Introductionmentioning

confidence: 99%

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Signature of room temperature ferromagnetism in Mn doped CeO2 nanoparticles

Kumar

Anwar

Choi

et al. 2012

Materials Research Bulletin

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

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Signature of room temperature ferromagnetism in Mn doped CeO2 nanoparticles

Kumar

Anwar

Choi

et al. 2012

Materials Research Bulletin

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“…The d (111) values are found to decrease with the Fe content, reflecting lattice parameters decrease with Fe doping which is in good agreement with the earlier reported results. 25 This behavior is expected due to the difference in the ionic radii of Ce and Fe. Therefore, the XRD results clearly indicate that Fe ions are replacing Ce ions in CeO 2 matrix and rule out the formation of any extra phase.…”

Section: Resultsmentioning

confidence: 92%

Electronic structure studies of Fe doped CeO2 thin films by resonance photoemission spectroscopy

Khare¹,

Choudhary²,

Phase³

et al. 2011

Journal of Applied Physics

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We have studied the modification in the electronic properties of pulsed laser deposited CeO2 thin films due to Fe doping (2 and 6 at %), with the help of x-ray photoemission spectroscopy (XPS) and resonance photoemission spectroscopy (RPES) measurements. XPS results indicate the ionic state of Fe in the Fe doped films, ruling out the possibility of Fe metallic clusters. Valence band spectra of CeO2 show an additional feature after Fe doping, suggesting its incorporation in the CeO2 matrix. RPES studies on these films reveal the hybridization between oxygen vacancy induced Ce localized states and Fe derived states.

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“…In addition to oxygen vacancies, TM doping has been shown to increase the RTFM of ceria NPs (6)(7)(8)(9)(10)(11)(12)(13). There are at least two possible mechanisms for RTFM enhancement by TM doping: creation of oxygen vacancies by introduction of a different-valance dopant into the host lattice and ferromagnetic ordering of a TM dopant.…”

Section: Introductionmentioning

confidence: 99%

Concentration dependence of magnetic moment in Ce1-xFexO2

Beausoleil

Thurber

Rao

et al. 2012

Journal of Applied Physics

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In this study, we examined the impact of iron doping on the structural, chemical, and magnetic properties of ceria (Ce 1-x Fe x O 2 ). Samples were produced in triplicate through a coprecipitation approach in a forced hydrolysis synthesis that yielded consistently sized nanocrystals, using three different cerium precursors: cerium chloride, cerium ammonium nitrate and cerium nitrate. Particles were characterized by x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), electron paramagnetic resonance (EPR) spectroscopy and vibrating sample magnetometry (VSM). XRD showed the average crystallite size to be 4.4 ± 1.2 nm, which agreed well with TEM data. XPS and EPR data shows iron to be in the Fe 3+ state and confirms the nominal dopant concentration. The moment per Fe ion found was largest at the lowest dopant concentrations, with values of 0.078 and 0.055 µ B /Fe ion for 0.1 and 0.5% Fe, respectively, which quickly decreased as the concentration was increased. We used XPS to estimate Ce 3+ /Ce 4+ ratio to be in the 0.2-0.3 range and observed a linear relation between the saturation magnetization and the Ce 3+ /Ce 4+ ratio.Introduction:

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Room temperature ferromagnetism in Fe-doped CeO2 thin films grown on LaAlO3 (001)

Cited by 36 publications

References 24 publications

Signature of room temperature ferromagnetism in Mn doped CeO2 nanoparticles

Signature of room temperature ferromagnetism in Mn doped CeO2 nanoparticles

Electronic structure studies of Fe doped CeO2 thin films by resonance photoemission spectroscopy

Concentration dependence of magnetic moment in Ce1-xFexO2

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