Valence state of Sm in single-crystalline EuO thin films

Reisner, Andreas; Kasinathan, Deepa; Wirth, S.; Tjeng, L. H.; Altendorf, S. G.

doi:10.1209/0295-5075/117/47001

Cited by 4 publications

(5 citation statements)

References 37 publications

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“…Sm 3d XPS spectra for the SNMO thin film system are depicted in figure S2 in SM. The observed Sm 3d photo emission spectral shapes match very well with Sm 2 O 3 (Sm valency: 3+) XPS data [28]. Comparing the 3d peak binding energy positions (3d 5/2 ∼ 1084.1 eV, 3d 3/2 ∼ 1111.2 eV), it is confirmed that Sm in SNMO is in 3+ valence state only.…”

Section: Resultssupporting

confidence: 75%

Robust electronic and tunable magnetic states in Sm₂ NiMnO₆ ferromagnetic insulator

Majumder¹,

Tripathi²,

Píš³

et al. 2022

J. Phys.: Condens. Matter

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Ferromagnetic insulators (FM-Is) are the materials of interest for new generation quantum electronic applications. Here, we have investigated the physical observables depicting FM-I ground states in epitaxial Sm2NiMnO6 (SNMO) double perovskite thin ﬁlms fabricated under diﬀerent conditions to realize diﬀerent level of Ni/Mn anti-site disorders (ASDs). The presence of ASDs immensely inﬂuence the characteristic magnetic and anisotropy behaviors in SNMO system by introducing short scale antiferromagnetic interactions in predominant long range FM ordered host matrix. Charge disproportion between cation sites in form of Ni2+ + Mn4+ −→ Ni3+ + Mn3+, causes mixed valency in both Ni and Mn species, which is found insensitive to ASD concentrations. Temperature dependent photo emission, photo absorption measurements duly combined with cluster model conﬁguration interaction simulations, suggest that the eigenstates of Ni and Mn cations can be satisfactorily described as a linear combination of the unscreened dn and screened dn+1L (L: O 2p hole) states. The electronic structure across the Fermi level (EF ) exhibits closely spaced Ni 3d, Mn 3d and O 2p states. From occupied and unoccupied bands, estimated values of the Coulomb repulsion energy (U) and ligand to metal charge transfer energy (∆), indicate charge transfer insulating nature, where remarkable modiﬁcation in Ni/Mn 3d - O 2p hybridization takes place across the FM transition temperature. Existence of ASD broadens the Ni, Mn 3d spectral features, whereas spectral positions are found to be unaltered. Hereby, present work demonstrates SNMO thin ﬁlm as a FM-I system, where FM state can be tuned by manipulating ASD in the crystal structure, while I state remains intact.

show abstract

Section: Resultssupporting

confidence: 75%

Robust electronic and tunable magnetic states in Sm₂ NiMnO₆ ferromagnetic insulator

Majumder¹,

Tripathi²,

Píš³

et al. 2022

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

show abstract

“…S2 in SM. The observed Sm 3d photo emission spectral shapes match very well with Sm 2 O 3 (Sm valency: 3+) XPS data [29]. Comparing the 3d peak binding energy positions (3d 5/2 ∼1084.1 eV, 3d 3/2 ∼1111.2 eV), it is confirmed that Sm in SNMO is in 3+ valence state only.…”

Section: Resultssupporting

confidence: 75%

Robust electronic and tunable magnetic states in Sm$ _{2} $NiMnO$ _{6} $ ferromagnetic insulator

Majumder,

Tripathi,

Píš

et al. 2022

Preprint

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Ferromagnetic insulators (FM-Is) are the materials of interest for new generation quantum electronic applications. Here, we have investigated the physical observables depicting FM-I ground states in epitaxial Sm 2 NiMnO 6 (SNMO) double perovskite thin films fabricated under different conditions to realize different level of Ni/Mn anti-site disorders (ASDs). The presence of ASDs immensely influence the characteristic magnetic and anisotropy behaviors in SNMO system by introducing short scale antiferromagnetic interactions in predominant long range FM ordered host matrix. Charge disproportion between cation sites in form of N i 2+ + M n 4+ −→ N i 3+ + M n 3+ , causes mixed valency in both Ni and Mn species, which is found insensitive to ASD concentrations. Temperature dependent photo emission, photo absorption measurements duly combined with cluster model configuration interaction simulations, suggest that the eigenstates of Ni and Mn cations can be satisfactorily described as a linear combination of the unscreened d n and screened d n+1 L (L: O 2p hole) states. The electronic structure across the Fermi level (E F ) exhibits closely spaced Ni 3d, Mn 3d and O 2p states. From occupied and unoccupied bands, estimated values of the Coulomb repulsion energy (U ) and ligand to metal charge transfer energy (∆), indicate charge transfer insulating nature, where remarkable modification in Ni/Mn 3d -O 2p hybridization takes place across the FM transition temperature. Existence of ASD broadens the Ni, Mn 3d spectral features, whereas spectral positions are found to be unaltered. Hereby, present work demonstrates SNMO thin film as a FM-I system, where FM state can be tuned by manipulating ASD in the crystal structure, while I state remains intact.

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“…The slight change and the decrease in the peaks separation, are related to the fact that the metallic character of the surface increases as a result of the stripping. [32][33][34] These energy values are slightly higher than expected for metallic Sm, because in the SmCo alloy, Sm is attached to Co, which is more electronegative. In addition, as shown in Figure 7b, the peaks corresponding to cobalt oxide were observed, and with the first pickling, the Co metallic signal increases considerably.…”

Section: −E [V] L [μM]mentioning

confidence: 79%

Very Low Potential Electrodeposition of Sm-Co Nanostructures in Aqueous Medium Using Hard Templates

Herrera

Riva

López

et al. 2019

J. Electrochem. Soc.

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Arrays of SmCo nanowires (NW) and nanotubes (NT) with a diameter of 200 nm and different lengths are synthesized by electrodeposition into the nanopores of an alumina membrane. The potential applied during the synthesis largely determines the nanostructure morphology, its crystallinity and composition. Potentials investigated are between −0.8 V and −3.0 V; in the potential range between −0.8 V and 1.0 V, long and perfectly ordered nanowires are obtained with a composition close to that of the equilibrium Sm 2 Co 17 phase in the binary alloy. For higher potentials, above −1 V, samples are nanotubes, 195 nm in external diameter and wall thickness of 30 nm with an equiatomical composition. Magnetic characterization reveals that all the nanostructures are soft ferromagnetic, with coercivity values below 60 mT. From the angular dependence of coercivity and the relative remanence it may concluded that in both, nanowires and nanotubes the magnetization reversal mechanism undergoes a transition from one at smaller angles, involving localized nucleation by curling, and further expansion of vortex-like domain walls. At higher angles, where the applied field is almost perpendicular to the NW/NT long axis, the mechanism changes to one involving nucleation by localized coherent rotation and further expansion of transverse Bloch-like walls.

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Valence state of Sm in single-crystalline EuO thin films

Cited by 4 publications

References 37 publications

Robust electronic and tunable magnetic states in Sm₂ NiMnO₆ ferromagnetic insulator

Robust electronic and tunable magnetic states in Sm₂ NiMnO₆ ferromagnetic insulator

Robust electronic and tunable magnetic states in Sm$ _{2} $NiMnO$ _{6} $ ferromagnetic insulator

Very Low Potential Electrodeposition of Sm-Co Nanostructures in Aqueous Medium Using Hard Templates

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Valence state of Sm in single-crystalline EuO thin films

Cited by 4 publications

References 37 publications

Robust electronic and tunable magnetic states in Sm2 NiMnO6 ferromagnetic insulator

Robust electronic and tunable magnetic states in Sm2 NiMnO6 ferromagnetic insulator

Robust electronic and tunable magnetic states in Sm$ _{2} $NiMnO$ _{6} $ ferromagnetic insulator

Very Low Potential Electrodeposition of Sm-Co Nanostructures in Aqueous Medium Using Hard Templates

Contact Info

Product

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Robust electronic and tunable magnetic states in Sm₂ NiMnO₆ ferromagnetic insulator

Robust electronic and tunable magnetic states in Sm₂ NiMnO₆ ferromagnetic insulator