Large anomalous Hall effect in a silicon-based magnetic semiconductor

Manyala, Ncholu I.; Sidis, Y.; DiTusa, J. F.; Aeppli, G.; Young, David P.; Fisk, Z.

doi:10.1038/nmat1103

Cited by 233 publications

(246 citation statements)

References 49 publications

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“…[17][18][19] Powder X-ray diffraction (XRD) spectra of the ground samples were taken with Cu Kα radiation (λ = 1.5418Å) using a Rigaku Miniflex x-ray machine. The lattice parameters were obtained by fitting the XRD pattern using the RIETICA software.…”

Section: Methodsmentioning

confidence: 99%

“…[17][18][19][20] Forming solid solution, i.e., maximizing the influence of point-defect scattering by creating large mass difference and elastic strain at the lattice sites, proved to be an efficient approach to suppress the thermal conductivity and enhance ZT of some thermoelectric materials, such as filled skutterudites materials Co(Sb 1−x As x ) 3 , Co …”

Section: Introductionmentioning

confidence: 99%

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Enhancement of the thermoelectric properties in doped FeSb2 bulk crystals

Warren

Petrović

2012

Journal of Applied Physics

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Kondo insulator FeSb 2 with large Seebeck coefficient would have potential in thermoelectric applications in cryogenic temperature range if it had not been for large thermal conductivity κ. Here we studied the influence of different chemical substitutions at Fe and Sb site on thermal conductivity and thermoelectric effect in high quality single crystals. At 5% of Te doping at Sb site thermal conductivity is suppressed from ∼ 250 W/Km in undoped sample to about 8 W/Km. However, Cr and Co doping at Fe site suppresses thermal conductivity more slowly than Te doping, and even at 20% Cr/Co doping the thermal conductivity remains ∼ 30 W/Km. The analysis of different contributions to phonon scattering indicates that the giant suppression of κ with Te is due to the enhanced point defect scattering originating from the strain field fluctuations. In contrast, Te-doping has small influence on the correlation effects and then for small Te substitution the large magnitude of the Seebeck coefficient is still preserved, leading to the enhanced thermoelectric figure of merit (ZT ∼ 0.05 at ∼ 100 K) in Fe(Sb 0.9 Te 0.1 ) 2 .

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancement of the thermoelectric properties in doped FeSb2 bulk crystals

Warren

Petrović

2012

Journal of Applied Physics

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“…It is important to mention that the bulk Mn-Pt-Ga system (when inhomogeneoous) shows a non-zero EB for temperatures up to only 150 K. [7] We now focus on transport measurements to characterize the CFI state and EB in Mn-Pt- Ga alloy. [13,14] It is interesting to note that The increase in the magnetization of the FC ) (H M loop in the bilayer film indicates that the exchange interaction at the interface also affects the total magnetic state of the sample. For more insight into this phenomenon we have measured the AHE of the bilayer film in ZFC and FC modes, as shown in Fig.…”

Section: Y=ptmentioning

confidence: 99%

Compensated Ferrimagnetic Tetragonal Heusler Thin Films for Antiferromagnetic Spintronics

et al. 2016

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Spintronics is a large field of research that involves the generation, manipulation and detection of spin currents in magnetic heterostructures and the use of these currents to excite and to set the state of magnetic nano-elements. [1,2] The field of spintronics has focused on ferromagnetic thin film structures in which charge currents can be spin-polarized via interfacial and volume spin dependent scattering. However, ferromagnets produce magnetostatic dipole fields, which increase in size as devices are scaled to smaller dimensions. These must be minimized or eleminated to enable operation of spintronic field sensing and magnetic memories. [2] One way to do this is to take advantage of the phenomenon of long-range oscillatory interlayer coupling [3] to create synthetic antiferromagnetic heterostructures [1] or the use of ferrimagnetic materials such as rare-earthtransition metal alloys at their compensation point. [4] The latter ferrimagnetic materials are of special inerest because they can completely eliminate dipole fields volumetrically, even on the atomic scale. However, materials are needed that can operate over a wide temperature window and not solely at or in the vicinity of a compensation temperature. Here we show that Heusler compounds can be designed for this purpose.Heusler compounds, YZ X 2 (where X , Y are transition metals and Z is a main-group 2 element), are well known for their potential applications in spintronics, especially in spin-torque based devices. [5] These materials crystallize in both cubic and tetragonal crystal structures with multiple magnetic sub-lattices, and hence are good candidates for engineering a wide range of complex magnetic structures. In particular all the known tetragonal Heuslers are ferrimagnetic with at least two magnetic sub-lattices whose magnetizations are aligned anti-parallel to one another, or, as has been shown recently, can be non-collinear to one another. The Mn based tetragonal Heuslers are of particular interest because their magnetic ordering temperatures can be well above room temperature, but the magnetizations of their two sub-lattices are typically distinct, leading to a net uncompensated magnetization. One of the most interesting of these materials is Mn3Ga which has a Curie temperature of ~750 K. [6] By tuning the magnetization of the two sublattices in Mn3Ga by changes in composition, we propose that a fully compensated ferrimagnetic (CFI) Heusler is possible. To help identify the needed compositional variations we have carried out density functional calculations of the electronic structures of Mn3-xYxGa   1 0   x (at zero temperature) for the elements = Y Ni, Cu, Rh, Pd, Ag, Ir, Pt, Au, which are non-magnetic or nearly non-magnetic when substituted into Mn3Ga. We show that in all these cases it is theoretically possible to obtain a CFI , which we have experimentally validated for the case of Y=Pt.The present calculation is based on the experimental lattice parameters of the bulk Mn 3 Ga lattice. [6] We find that a compensated mag...

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“…Fe x Co (1−x) Si exhibits itinerant helimagnetic metallic behavior like MnSi for 0.4 < x < 0.9 (T c = 60K for x = 0.6) although the two end-compounds FeSi and CoSi do not exhibit any magnetic order [9][10][11][12]. Doping FeSi with Mn has revealed that the unscreened Kondo effect was at the origin of non-Fermi liquid behavior [13].…”

Section: Introductionmentioning

confidence: 99%

Spin-glass ground state inMn1−xCoxSi

et al. 2010

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We report the discovery of a new spin glass ground state in the transition metal monosilicides with the B20 crystallographic structure. Magnetic, transport, neutron and muon investigation of the solid solution Mn1−xCoxSi have revealed a new dome in the phase diagram with evidence of antiferromagnetic interactions. For Mn rich compounds, a sharp decrease of the Curie temperature is observed upon Co doping and neutron elastic scattering shows that helimagnetic order of MnSi persists up to x = 0.05 with a shortening of the helix period. For higher Co (0.05 < x < 0.90) concentrations, the Curie-Weiss temperature changes sign and the system enters a spin glass state upon cooling (Tg = 9 K for xCo = 0.50), due to chemical disorder. In this doping range, a minimum appears in the resistivity, attributed to scattering of conduction electron by localized magnetic moments.

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Large anomalous Hall effect in a silicon-based magnetic semiconductor

Cited by 233 publications

References 49 publications

Enhancement of the thermoelectric properties in doped FeSb2 bulk crystals

Enhancement of the thermoelectric properties in doped FeSb2 bulk crystals

Compensated Ferrimagnetic Tetragonal Heusler Thin Films for Antiferromagnetic Spintronics

Spin-glass ground state inMn1−xCoxSi

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