<i>Magnetism in Condensed Matter</i>

Blundell, Stephen J.; Thouless, D. J.

doi:10.1119/1.1522704

Cited by 691 publications

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“…Note that the discrepancy for Ln = Sm (the experimental value of effective moment is much bigger than the theoretical one) is frequently seen, which is due to low-lying excite states with different J from the ground states. 30 We found that the T c value in RbLn 2 Fe 4 As 4 O 2 remains unchanged (within ± 0.1 K), irrespective of sample's purity. This fact suggests that RbLn 2 Fe 4 As 4 O 2 is a line compound which bears the same hole-doping level of 25%, similar to the case in 1144-type superconductors.…”

Section: Resultsmentioning

confidence: 76%

Synthesis, Crystal Structure and Superconductivity in RbLn₂Fe₄As₄O₂(Ln = Sm, Tb, Dy, and Ho)

Wang

et al. 2017

Chem. Mater.

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We have synthesized four iron-based oxyarsenide superconductors RbLn 2 Fe 4 As 4 O 2 (Ln = Sm, Tb, Dy and Ho) resulting from the intergrowth of RbFe 2 As 2 and LnFeAsO.It is found that the lattice match between RbFe 2 As 2 and LnFeAsO is crucial for the phase formation. The structural intergrowth leads to double asymmetric Fe 2 As 2 layers that are separated by insulating Ln 2 O 2 slabs. Consequently, the materials are intrinsically doped at a level of 0.25 holes/Fe-atom and, bulk superconductivity emerges at T c = 35.8, 34.7, 34.3 and 33.8 K, respectively, for Ln = Sm, Tb, Dy and Ho. Investigation on the correlation between crystal structure and T c suggests that interlayer couplings may play an additional role for optimization of superconductivity.

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Section: Resultsmentioning

confidence: 76%

Synthesis, Crystal Structure and Superconductivity in RbLn₂Fe₄As₄O₂(Ln = Sm, Tb, Dy, and Ho)

Wang

et al. 2017

Chem. Mater.

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“…The uniaxial anisotropy field is also reduced for Al 30 Ga 70 As(001), indicating a stronger uniaxial magnetic anisotropy in structures with GaAs(001). The reason for the difference in reversal-mechanism may be explained due to the surface corrugation: one may calculate a Néel-type domain-wall width 30 of D ∼ 150 nm for these Co 40 Fe 40 B 20 films: it seems reasonable that the substrate surface corrugation is able to influence domain-walls for Co 40 Fe 40 B 20 on Al 30 Ga 70 As(001), where D ∼ ξ. Fortuitously, the orientation of the surface corrugation relative the the easy-axis of the uniaxial magnetic anisotropy allows step-edge anisotropies also to be ruled out as contributory factors in determining the magnetic anisotropy 56 . Indeed, the only mechanism which may plausibly explain both the direction and magnitude of the uniaxial magnetic anisotropy is the interface-interaction between ferromagnetic metals and III-V(001) semiconductors; despite the lack of crystal symmetry in the Co 40 Fe 40 B 20 films.…”

Section: Interfacial Magnetic Anisotropy In Amorphous Filmsmentioning

confidence: 99%

“…Kipferl et al compared the 'Bloch-3/2 law' spin-wave parameters 30 for Fe films epitaxially deposited on GaAs(001) and Au(001), finding a smaller depolarization due to thermal spin-waves in Fe/GaAs(001) as a consequence of the additional magnetic anisotropy contribution from the interfacial uniaxial magnetic anisotropy 60 . 63 .…”

Section: Influence Of the Underlying Compound Semiconductormentioning

confidence: 99%

Interface Magnetism in Ferromagnetic Metal–compound Semiconductor Hybrid Structures

Hindmarch

2011

SPIN

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Interfaces between dissimilar materials present a wide range of fascinating physical phenomena. When a nanoscale thin-film of a ferromagnetic metal is deposited in intimate contact with a compound semiconductor, the properties of the interface exhibit a wealth of novel behavior, having immense potential for technological application, and being of great interest from the perspective of fundamental physics. This article presents a review of recent advances in the field of interface magnetism in (001)-oriented ferromagnetic metal/III–V compound semiconductor hybrid structures. Until relatively recently, the majority of research in this area continued to concentrate almost exclusively on the prototypical epitaxial Fe / GaAs (001) system: now, a significant proportion of work has branched out from this theme, including ferromagnetic metal alloys, and other III–V compound semiconductors. After a general overview of the topic, and a review of the more recent literature, we discuss recent results where advances have been made in our understanding of the physics underpinning magnetic anisotropy in these systems: tailoring the terms contributing to the angular-dependent free-energy density by employing novel fabrication methods and ferromagnetic metal electrodes.

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“…9) for the three samples, measured at 2.5 mT show a similar response to that expected for a superparamagnetic nanoparticulate system, though the FC data appearing to saturate as temperature is lowered. The individual blocking temperatures (T B ) vary between samples, as indicated in Table 3, which might be expected for nickel nanoparticles with differing sizes as T B ∝ V where V is the volume of the superparamagentic particle [23]. However, PXRD data suggest that sample 1 has the smallest particle size, with sample 2 the next largest and sample 4 the largest; the blocking temperatures do not follow this trend.…”

Section: Samples 1 2 Andmentioning

confidence: 94%

“…where α = 100 and τ 0 = 10 −9 s [23]. We used values of V from both PXRD (Scherrer equation) data and also deduced from the mean magnetic moments which are obtained fitting a Langevin function to M vs. H data at 290 K, which will be explained later.…”

Section: Samples 1 2 Andmentioning

confidence: 99%

Controlling nickel nanoparticle size in an organic/metal–organic matrix through the use of different solvents

2013

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(2013) 'Controlling nickel nanoparticle size in an organic/metal-organic matrix through the use of di erent solvents. ', Nanoscale., 5 (24). pp. 12212-12223. Further information on publisher's website:http://dx.doi.org/10.1039/c3nr04883gPublisher's copyright statement:Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. (0) atoms from the Ni(COD)2. Materials are characterised with a combination of X-ray diffraction, electron microscopy and magnetometry and it is found that samples made using a halocarbon solvent resulted in clustered bulk Ni particles (size ≤ 10 nm) with anomalously high superparamagnetic blocking temperatures. Using an isocyanide solvent produces smaller (size ∼ 1 nm), well dispersed particles that show little evidence of superparamagnetic blocking in the range of temperatures investigated (> 2 K). In all samples there is another component which dominates the magnetic response at low temperatures and shows an interesting temperature dependent scaling behaviour when plotted as M vs B/T which we believe is related to the organo-metallic matrix that the particles are trapped within. We propose that the enhanced blocking temperature of particles synthesised using halocarbon solvents can be attributed to inter-particle dipolar interactions and nanoparticle-matrix exchange interactions.

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Magnetism in Condensed Matter

Cited by 691 publications

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Synthesis, Crystal Structure and Superconductivity in RbLn₂Fe₄As₄O₂(Ln = Sm, Tb, Dy, and Ho)

Synthesis, Crystal Structure and Superconductivity in RbLn₂Fe₄As₄O₂(Ln = Sm, Tb, Dy, and Ho)

Interface Magnetism in Ferromagnetic Metal–compound Semiconductor Hybrid Structures

Controlling nickel nanoparticle size in an organic/metal–organic matrix through the use of different solvents

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Magnetism in Condensed Matter

Cited by 691 publications

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Synthesis, Crystal Structure and Superconductivity in RbLn2Fe4As4O2(Ln = Sm, Tb, Dy, and Ho)

Synthesis, Crystal Structure and Superconductivity in RbLn2Fe4As4O2(Ln = Sm, Tb, Dy, and Ho)

Interface Magnetism in Ferromagnetic Metal–compound Semiconductor Hybrid Structures

Controlling nickel nanoparticle size in an organic/metal–organic matrix through the use of different solvents

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Product

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Synthesis, Crystal Structure and Superconductivity in RbLn₂Fe₄As₄O₂(Ln = Sm, Tb, Dy, and Ho)

Synthesis, Crystal Structure and Superconductivity in RbLn₂Fe₄As₄O₂(Ln = Sm, Tb, Dy, and Ho)