Giant magnetoresistance effects in intermetallic compounds (invited)

Sechovský, V.; Havela, L.; Prokeš, K.; Nakotte, H.; Boer, F.R. de; Brück, E.H.

doi:10.1063/1.358114

Cited by 67 publications

(48 citation statements)

References 25 publications

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“…One can see a very sharp negative minimum peaking exactly at T C = 30 K, where ρ/ρ reaches as huge value of MR as −73%. This value is comparable to those found earlier for another 1:1:1 equiatomic compounds, like UNiGa, UNiGe and UPdIn, exhibiting metamagnetic transitions [6][7][8][9]. Fig.…”

Section: Updge [Orthorhombic Tinisi-type]supporting

confidence: 91%

“…As it will be discussed below, this property may be intimately connected with the discovery of a huge MR at the Curie temperatures of these Si-and Ge-based compounds amounting as large as −36% and −40%, respectively [19]. However, these huge values have not their origin in any MTM transition like for the isostructural, antiferromagnetic UNiGe [6,7]. Moreover, the temperature dependence of ρ/ρ(T) at 8 T in these two cases approaches zero value far above T C , but not earlier than at the temperature of 3T C indicating the development of spin(magnetic) fluctuations starting already below about 30 K in accordance with the data of recent thermal expansion measurements [20].…”

Section: Urhsi and Urhge [Orthorhombictinisi-type Sg Pnma]mentioning

confidence: 92%

“…in layer-like structures such as the hexagonal ZrNiAl type or the chain-line-like orthorhombic TiNiSi-type [6][7][8][9]. In all these cases one should drive a given antiferromagnetic uranium compound through a MTM transition towards an induced ferromagnetic alignment.…”

Section: Introductionmentioning

confidence: 98%

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Magnetoresistivity studies of intermetallic uranium compounds and their impact on the understanding of exhibited phenomena

Troć

2006

Journal of Alloys and Compounds

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Section: Updge [Orthorhombic Tinisi-type]supporting

confidence: 91%

Section: Urhsi and Urhge [Orthorhombictinisi-type Sg Pnma]mentioning

confidence: 92%

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Magnetoresistivity studies of intermetallic uranium compounds and their impact on the understanding of exhibited phenomena

Troć

2006

Journal of Alloys and Compounds

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“…In any material, the application of a magnetic field deviate conduction electrons from their path and thus leads to an increase in the resistivity value, thereby a positive MR. The positive increase in the MR is termed as Lorentz contribution [73]. In spite of the presence of the Lorentz contribution, intermetallic compounds in general show a decrease in the resistivity, thereby resulting in negative MR, which may originate from the suppression of the spin fluctuations by the field or by the decrease in the spin disorder scattering.…”

Section: Magneto-transport Propertiesmentioning

confidence: 99%

Equiatomic quaternary Heusler alloys: A material perspective for spintronic applications

Bainsla

Суреш

2016

Applied Physics Reviews

263

104

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Half-metallic ferromagnetic (HMF) materials show high spin polarization and are therefore interesting to researchers due to their possible applications in spintronic devices. In these materials, while one spin sub band has a finite density of states at the Fermi level, the other sub band has a gap. Because of their high Curie temperature (TC) and tunable electronic been reported in a few systems, which are also discussed in this review. Thus, this review presents a consolidated picture of the magnetic and spintronic properties of this important, but relatively new class of Heusler alloys. It is expected that this will stimulate further interest in these alloys, thereby paving the way for the identification of more HMF and SGS materials. As a result of this, it is expected that more efficient spintronic devices using these alloys would emerge in the near future.

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“…GMR is not exclusive to the 3d metal systems, it has also been observed in certain alloys containing rare-earth (RE) elements. However, in this case the mechanism of 4f-GMR effect is different and has not yet been fully understood [4]. It is also known that paramagnetic RE atoms in a metallic matrix can show magnetoresistance effects [5].…”

mentioning

confidence: 99%

Giant Magnetoresistance in Melt-Spun Co-Cu Modified by Rare Earths

et al. 2000

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Samples of the composition RE x Co20 Cu80-x , RE = Sm, Gd or Dy (x = 0, 1, and 3) were produced by melt-spinning and subsequent annealing. The magnetoresistance is negative as in granular Co-Cu, but its values depend on the kind of rare earth element added and on changes in the microstructure induced by thermal annealing. An addition of 1 at.% rare earth metal to Co20 Cu 80 yields a considerable increase in the magnetoresistance ratio, whereas an addition of 3 at.% causes a decrease. E.g., by addition of 1 at.% Dy to Co20 Cum and optimal thermal treatment, the value of magnetoresistance ratio measured at 10 K in a field of 5 T increases from -14% to -28%. The effect can be attributed to the presence of clusters of hexagonal Dy(Co,Cu) 5 , which was ascertained from X-ray diffraction data, or other, metastable rare-earth compounds and paramagnetic rare-earth atoms in the Cu matrix.PACS numbers: 75.70.Ρa, 75.50.TtGranular solids consisting of nano-sized particles of ferromagnetic metals dispersed in a nonmagnetic metallic matrix have recently been the subject of particular interest mainly because of their unusual magnetotransport properties. Frequently, the magnetoresistance of such materials is isotropic and negative. This effect is the so-called giant magnetoresistance (GMR). Such granular metals can be derived from supersaturated alloys of immiscible systems, which may be produced by magnetron sputtering [1], mechanical alloying [2] or melt-spinning [3], usually followed by a thermal treatment to prompt a decomposition reaction. A well-known example of a granular system showing the GMR-effect is the Cu-Co system. Due to incomplete mixing and/or by a decomposition reaction, ultrafine Co-precipitates in a Cu-rich matrix can be produced [1,3]. The Co-precipitates Β. Idzikowski acknowledges support by Saxonian Ministry for Sciences and Arts. †

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Giant magnetoresistance effects in intermetallic compounds (invited)

Cited by 67 publications

References 25 publications

Magnetoresistivity studies of intermetallic uranium compounds and their impact on the understanding of exhibited phenomena

Magnetoresistivity studies of intermetallic uranium compounds and their impact on the understanding of exhibited phenomena

Equiatomic quaternary Heusler alloys: A material perspective for spintronic applications

Giant Magnetoresistance in Melt-Spun Co-Cu Modified by Rare Earths

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