The Partial Equilibrium Diagram of the Fe-Ge System in the Range 40-72 at. % Ge, and the Crystallisation of some Iron Germanides by Chemical Transport Reactions.

Richardson, M.; Ingri, Nils; Salomaa, Pentti; Bloom, Gunnar D.; Hagen, G.

doi:10.3891/acta.chem.scand.21-2305

Cited by 101 publications

(66 citation statements)

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“…Single crystals of -FeGe were grown by chemical vapor transport using iodine as transport agent [4] in a homemade two zone furnace. -FeGe crystallized very slowly by an endothermal transport reaction from 850 to 810 K although the transport was made perpendicular to the tube axis [5].…”

Section: Sample Growth and Characterizationmentioning

confidence: 99%

Structural investigations of -FeGe at high pressure and low temperature

Wilhelm

Schmidt²,

Cardoso‐Gil³

et al. 2007

Science and Technology of Advanced Materials

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The structural parameters of -FeGe have been determined at ambient conditions using single crystal refinement. Powder diffraction has been carried out to determine structural properties and compressibility for pressures up to 30 GPa and temperatures as low as 82 K. The discontinuous change in the pressure dependence of the shortest Fe-Ge interatomic distance might be interpreted as a symmetryconserving transition and seems to be related to a magnetic phase boundary line. r

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Section: Sample Growth and Characterizationmentioning

confidence: 99%

Structural investigations of -FeGe at high pressure and low temperature

Wilhelm

Schmidt²,

Cardoso‐Gil³

et al. 2007

Science and Technology of Advanced Materials

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“…278.2 [10] 1 [11] 4.700 [12] 700 [1] 0.359 [13] MnSi 29.5 [14] 0.4 [14] 4.559 [15] 180 [2] 0.62 [16] MnGe (a) 170 [3] 1.7 [3] 4.795 [17] 30 [3] 12 [3] Mn 0.9 Fe 0.1 Si 6.8 [18] 0.17 (b) 4.5529 100 [9] 0.645 [9] Fe 0.65 Co 0. 35 Si 58.8 [4] 0.218 [4] 4.471 [19] 471 [5] 0.145 [4] (a) orders antiferromagnetically; (b) interpolated value using data in Ref [8].…”

Section: Introductionmentioning

confidence: 99%

Confinement of chiral magnetic modulations in the precursor region of FeGe

Wilhelm

Baenitz

Schmidt

et al. 2012

J. Phys.: Condens. Matter

111

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Abstract. We report on magnetic susceptibility and specific heat measurements of the cubic helimagnet FeGe in external magnetic fields and temperatures near the onset of long-range magnetic order at T C = 278.2(3) K. Pronounced anomalies in the field-dependent χac(H) data as well as in the corresponding imaginary part χ ac (H) reveal a precursor region around T C in the magnetic phase diagram. The occurrence of a maximum at T 0 = 279.6 K in the zero-field specific heat data indicates a second order transition into a magnetically ordered state. A shoulder evolves above this maximum as a magnetic field is applied. The field dependence of both features coincides with crossover lines from the field-polarized to the paramagnetic state deduced from χac(T ) at constant magnetic fields. The experimental findings are analyzed within the standard Dzyaloshinskii theory for cubic helimagnets. The remarkable multiplicity of modulated precursor states and the complexity of the magnetic phase diagram near the magnetic ordering are explained by the change of the character of solitonic inter-core interactions and the onset of specific confined chiral modulations in this area.

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“…29 We determined the structure and crystallographic orientation of a millimetersized, pyramid-shaped B20 FeGe crystal using Laue X-ray diffraction prior to MAS experiments (see Fig. S1).…”

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confidence: 99%

Topological spin dynamics in cubic FeGe near room temperature

Turgut

Stolt

Jin

et al. 2017

Journal of Applied Physics

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Understanding spin-wave dynamics in chiral magnets is a key step for the development of highspeed, spin-wave based spintronic devices that take advantage of chiral and topological spin textures for their operation. Here we present an experimental and theoretical study of spin-wave dynamics in a cubic B20 FeGe single crystal. Using the combination of waveguide microwave absorption spectroscopy (MAS), micromagnetic simulations, and analytical theory, we identify the resonance dynamics in all magnetic phases (field polarized, conical, helical, and skyrmion phases). Because the resonance frequencies of specific chiral spin textures are unique, quantitative agreement between our theoretical predictions and experimental findings for all resonance frequencies and spin wave modes enables us to unambiguously identify chiral magnetic phases and to demonstrate that MAS is a powerful tool to efficiently extract a magnetic phase diagram. These results provide a new tool to accelerate the integration of chiral magnetic materials into spintronic devices.Identifying and understanding of spin-wave excitations in chiral and topological magnetic materials is a fundamental step towards their integration into spintronic devices. Moreover, some of these materials host magnetic skyrmions, in which spins form a topologically non-trivial excitation with an integer winding number. 1,2 Magnetic skyrmions can be driven to move by spin torques with an ultralow current threshold because there is weak or no pinning, 3,4 which makes them appealing for low-power memory, 5 magnetic logic, 6 and auto-oscillator 7 devices. In support of these potential applications, magnetic skyrmions have been investigated using several methods including Lorentz transmission electron microscopy (LTEM), [8][9][10] inelastic neutron scattering, 11,12 magnetic susceptibility, 13,14 and recently by microwave absorption spectroscopy. 15,16 Microwave absorption spectroscopy (MAS), in particular, is a powerful tool for identifying and studying dynamical magnetic excitations in materials. In materials with several complex magnetic phases, such as chiral magnetic materials with a volume Dzyaloshinskii-Moriya interaction, it may be possible to use MAS to quickly establish a magnetic phase diagram because the spin texture in each magnetic phase has a unique resonance response. This specificity gives MAS an advantage as compared to electrical measurements such as the topological Hall effect, [17][18][19][20][21][22] which is more difficult to interpret because the signals are not unique to skyrmion phases or helical phases. [19][20][21][22][23][24] In this letter, we present a study of spin-wave dynamics in a single crystal of B20 FeGe using MAS. Specifically, we measure the gigahertz frequency dynamic susceptibility of FeGe using a field-referenced lock-in technique, which significantly increases our sensitivity to magnetic phase boundaries as compared to conventional MAS. 15 We observe the resonance response in all the magnetic phases (field polarized, conical, helical and...

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The Partial Equilibrium Diagram of the Fe-Ge System in the Range 40-72 at. % Ge, and the Crystallisation of some Iron Germanides by Chemical Transport Reactions.

Cited by 101 publications

References 0 publications

Structural investigations of -FeGe at high pressure and low temperature

Structural investigations of -FeGe at high pressure and low temperature

Confinement of chiral magnetic modulations in the precursor region of FeGe

Topological spin dynamics in cubic FeGe near room temperature

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