The hyperfine fields at Mn in ferromagnetic Mn<sub>5</sub>Ge<sub>3</sub>

Jackson, Richard; Scurlock, R.G.; Utton, D.B.; Wray, E M

doi:10.1088/0370-1328/85/1/316

Cited by 17 publications

(8 citation statements)

References 7 publications

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“…According to previous neutron scattering experiments [19], the magnetic structure of Mn 5 Ge 3 is found to reveal two Mn sublattices (Mn1 in a fourfold and Mn2 in a six-fold position) with different magnetic moments. It was suggested that Mn2 carries the larger moment, in agreement with zero-field NMR measurements [20]. Our results are in excellent quantitative and qualitative agreement with these results.…”

Section: Magnetic Moments Spin and Charge Densitysupporting

confidence: 91%

“…In particular, we point out that the inclusion of the (positive) orbital term improves (worsens) the agreement with experiment in the case of Mn1 (Mn2). In fact, by means of zero-field NMR and specific heat measurements, the magnitude of the experimental effective nuclear fields were determined as 195 kOe at the 4(d) Mn site and 399 kOe at the 6(g) Mn site [20]. The agreement of the calculated values (H tot hf (Mn 1 ) = -192 kOe and H tot hf (Mn 2 ) = -342 kOe) with experiments is seen to be reasonably good.…”

Section: Magnetic Moments Spin and Charge Densitymentioning

confidence: 74%

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First-principles characterization of ferromagneticMn5Ge3for spintronic applications

2004

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In the active search for potentially promising candidates for spintronic applications, we focus on the intermetallic ferromagnetic Mn5Ge3 compound and perform accurate first-principles FLAPW calculations within density functional theory. Through a careful investigation of the bulk electronic and magnetic structure, our results for the total magnetization, atomic magnetic moments, metallic conducting character and hyperfine fields are found to be in good agreement with experiments, and are elucidated in terms of a hybridization mechanism and exchange interaction. In order to assess the potential of this compound for spin-injection purposes, we calculate Fermi velocities and degree of spin-polarization; our results predict a rather high spin-injection efficiency in the diffusive regime along the hexagonal c-axis. Magneto-optical properties, such as L2,3 X-ray magnetic circular dichroism, are also reported and await comparison with experimental data.

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Section: Magnetic Moments Spin and Charge Densitysupporting

confidence: 91%

Section: Magnetic Moments Spin and Charge Densitymentioning

confidence: 74%

First-principles characterization of ferromagneticMn5Ge3for spintronic applications

2004

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“…Furthermore, the TC of Mn5Ge3 was shifted much above room temperature by applying strain engineering (320 K) [8], quantum confinement (400 K) [9] or co-doping with carbon (430 K) [10,11]. The fundamental properties of Mn5Ge3, especially the magnetic structure, have been investigated in detail [12][13][14]. Mn5Ge3 possesses a hexagonal D88-type crystal structure with space group P63/mcm whose unit cell contains 6 Ge and 10 Mn atoms.…”

Section: Introductionmentioning

confidence: 99%

Strain-induced switching between noncollinear and collinear spin configuration in magnetic Mn5Ge3 films

et al. 2021

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We report the temperature-dependent magnetic and structural properties of epitaxial Mn5Ge3 thin films grown on Ge substrates. Utilizing density-functional theory (DFT) calculations and various experimental methods, we reveal mechanisms governing the switching between collinear and noncollinear spin configuration in Mn5Ge3. The Mn atoms in Mn5Ge3 occupy two distinct Wyckoff positions with fourfold (Mn1) and sixfold (Mn2) multiplicity. The DFT calculations reveal that below a critical distance of approximately 3.002 Å the coupling between Mn2 atoms is antiferromagnetic (AFM) while ferromagnetic (FM) above that critical distance. The FM coupling between Mn1 atoms is weakly affected by the strain. The observed noncollinear spin configuration is due to the coexistence of AFM and FM coupling at low temperatures. The findings give insight in developing strain controlled spintronic devices. The author Y.X. (File No. 201706340054) acknowledges the financial support by China Scholarship Council. M.B. is funded by the National Science Centre Grant No. UMO-2016/23/D/ST3/03446. Access to computing facilities of PL-Grid Polish Infrastructure for Supporting Computational Science in the European Research Space and of the Interdisciplinary Center of Modeling (ICM), University of Warsaw is gratefully acknowledged. M.B. made use of computing facilities of TU Dresden ZIH within the project "TransPheMat". The low temperature X-ray diffraction was performed in MGML (http://mgml.eu/), which was supported within the program of Czech Research Infrastructures (Project No. LM2018096). Author contribution Author Y.X. performed the basic magnetic and transport measurements. Y.Y. and C.Z. performed angular dependent magnetoresistance measurements. P.D. and D.K. performed the temperature dependent XRD measurements. M.B. performed the DFT calculations and related analyses. J.G. contributed to the discussion about structural analyses. D.K. and X.Z. contributed to the discussion about transport analyses. M.H., S.Z., L.C., Y.-J.Z. and M.W. contributed to the revision of the manuscript. S.P. designed and supervised the whole project.

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“…We have used 55 Mn nuclear magnetic resonance (NMR), a powerful local tool giving selective information on manganese ions occupying two crystallographic sites and carrying distinctly different magnetic moments [9]. 55 Mn NMR studies in this compound have been previously reported in zero field [10] and in presence of the weak magnetic field (below magnetic saturation) [11]. However, these previous studies have been carried out on the randomly oriented polycrystalline samples and do not help to understand the anisotropic properties.…”

Section: Introductionmentioning

confidence: 99%

Hyperfine fields and anisotropy of the orbital moment in epitaxial Mn5Ge3 films studied by Mn55 NMR

et al. 2018

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55 Mn NMR was used to perform the atomic-scale study of the anisotropic properties of Mn 5 Ge 3 /Ge(111) epitaxial films with thicknesses between 9 and 300 nm. The NMR spectra have been recorded as a function of strong external magnetic field applied in the film plane and perpendicular to it. Two 55 Mn NMR resonances have been observed, corresponding to the two manganese sites 4d and 6g, in the hexagonal D8 8 structure; in zero field their frequency is centered around 207.5 and 428 MHz, respectively. The anisotropy of 55 Mn hyperfine fields between the hexagonal c direction and the c plane at both Mn sites was evidenced and attributed to the anisotropic term due to the unquenched Mn orbital momentum. The anisotropy of the orbital contribution to hyperfine fields was determined as 1.52 T in the 4d site and up to 2.77 T in the 6g site. The 4d site reveals a quadrupolar interaction due to the strong electric field gradient: V zz = 5.3 × 10 19 V/m 2 in this site, which is shown to be oriented along the hexagonal c axis.

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The hyperfine fields at Mn in ferromagnetic Mn₅Ge₃

Cited by 17 publications

References 7 publications

First-principles characterization of ferromagneticMn5Ge3for spintronic applications

First-principles characterization of ferromagneticMn5Ge3for spintronic applications

Strain-induced switching between noncollinear and collinear spin configuration in magnetic Mn5Ge3 films

Hyperfine fields and anisotropy of the orbital moment in epitaxial Mn5Ge3 films studied by Mn55 NMR

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The hyperfine fields at Mn in ferromagnetic Mn5Ge3

Cited by 17 publications

References 7 publications

First-principles characterization of ferromagneticMn5Ge3for spintronic applications

First-principles characterization of ferromagneticMn5Ge3for spintronic applications

Strain-induced switching between noncollinear and collinear spin configuration in magnetic Mn5Ge3 films

Hyperfine fields and anisotropy of the orbital moment in epitaxial Mn5Ge3 films studied by Mn55 NMR

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The hyperfine fields at Mn in ferromagnetic Mn₅Ge₃