Matrix and Impurity-Cluster Polarization in Ni-Pt and Ni-Pd Alloys

Ferrando, W. A.; Segnan, R.; Schindler, A. I.

doi:10.1103/physrevb.5.4657

Cited by 31 publications

(8 citation statements)

References 9 publications

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“…[1][2][3][4] Indeed, palladium is the 4d parent of nickel. It is close to being ferromagnetic according to the Stoner criterium, and forms a ferromagnetic alloy with nickel down to Ni atomic concentrations as small as ≈ 2 %, 5,6 with a smoothly varying Curie temperature, 7 due to its large magnetic polarizability.…”

Section: Introductionmentioning

confidence: 99%

Magnetization textures in NiPd nanostructures

et al. 2011

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We have observed peculiar magnetization textures in Ni80Pd20 nanostructures using three different imaging techniques: magnetic force microscopy, photoemission electron microscopy under polarized X-ray absorption, and scanning electron microscopy with polarization analysis. The appearances of diamond-like domains with strong lateral charges and of weak stripe structures bring into evidence the presence of both a transverse and a perpendicular anisotropy in these nanostrips. This anisotropy is seen to reinforce as temperature decreases, as testified by a simplified domain structure at 150 K. A thermal stress relaxation model is proposed to account for these observations. Elastic calculations coupled to micromagnetic simulations support qualitatively this model.

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Section: Introductionmentioning

confidence: 99%

Magnetization textures in NiPd nanostructures

et al. 2011

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“…Our results for nickel concentrations x # 0.1 are plotted in Fig. 1, together with all published data [20,28,29] (we only omitted Mössbauer data where additional Fe impurities have been used as probe ions [30]). We determined the T c values from the paramagnetic (PM) Curie temperatures.…”

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confidence: 95%

Non-Fermi-Liquid Behavior at a Ferromagnetic Quantum Critical Point inNixPd1−x

et al. 1999

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Ni x Pd 12x is investigated at the border of enhanced Pauli paramagnetism and itinerant ferromagnetism. We provide convincing experimental evidence for the occurrence of a ferromagnetic (FM) quantum critical point (QCP). At a nickel concentration x 0.025 6 0.002, the concentration dependence of the Curie temperature, as well as the temperature dependencies of the electrical resistivity, the magnetic susceptibility, and of the linear term of the specific heat follow the theoretical predictions of a FM QCP within experimental uncertainties. [S0031-9007(99)09221-2] PACS numbers: 71.10. Hf, 75.40.Cx, 75.50.Cc After the observation of striking departures from the predictions of Fermi-liquid theory in U x Y 12x Pd 3 [1,2], during the last decade non-Fermi-liquid (NFL) behavior of highly correlated electron systems was in the focus of experimentalists and theoreticians [3]. In most cases reported so far, NFL behavior appears close to the phase boundary of magnetic order. A continuous increase of the linear term of the heat capacity down to the lowest temperatures and significant deviations from a T 2 dependence of the resistivity were classified as hallmarks of NFL behavior. The largest body of experimental evidence has been presented in heavy-fermion systems (HFS), in which competing RKKY and Kondo interactions offer the opportunity to tune the systems towards vanishing magnetic order. Alloying or pressure have been used to establish a T 0 K magnetic phase transition.To describe the experimental observations different theoretical concepts have been worked out. For Kondo systems two-channel [4] and multichannel Kondo models [5] have been developed. In diluted systems which reveal inherent disorder, theories taking a distribution of Kondo temperatures into account [6] or an interpretation in terms of a spin-glass-like Griffiths phase [7] have been proposed. Finally, theories were derived which exhibit a ferromagnetic (FM) or antiferromagnetic (AFM) quantum critical point (QCP) characterized by a T 0 K phase-transition temperature. Using renormalizationgroup theories [8,9] it has been shown that quantum systems depend crucially on the spatial dimensions and on the dynamic exponent. Quantum phase transitions also were described in terms of phenomenological spinfluctuation models with great success [10][11][12].So far most of the investigations in the field of HFS deal with vanishing AFM phase transitions (for a review, see [13]). From the many systems that have been studied, CeCu 62x Au x [14] and CeNi 2 Ge 2 [15] are the most promising candidates for the observations of a QCP. In the former case, heat capacity and resistivity can be consistently explained taking two-dimensional spin fluctuations into account and neutron scattering results revealed that these fluctuations indeed may exist [16]. In CeNi 2 Ge 2 [15] the heat capacity and the thermal expansion revealed an increase towards low temperatures as theoretically predicted for an AFM QCP. One of the rare examples of HFS which is close to ferromagnetic order is Th ...

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“…In the bulk, the NiPd alloy assumes an fcc structure and is known to exhibit ferromagnetic ordering down to a Ni content as low as 3%. 8 One may therefore expect that films can be stabilized over a large compositional range without encountering structural changes or abrupt variations of the magnetic moment. The pure Ni films on Cu 3 Au(100) exhibit an inverse SRT, similar to the one observed in Ni/Cu͑100͒.…”

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confidence: 99%