Orbital magnetic moment of “half-metallic” Co2MnGe

Miyamoto, Koji; Kimura, Akio; Iori, K.; Xie, Tian; Sakamoto, Kazuaki; Moko, Tsutomu; Qiao, Shuang; Takeuchi, Masaki; Tsuchiya, K.

doi:10.1016/j.physb.2004.06.050

Cited by 6 publications

(5 citation statements)

References 13 publications

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“…1c , clear positive and negative XMCD signals are observed for the L 3 and L 2 edges, respectively. This feature is indeed opposite to the case for the conventional ferromagnetic Mn compounds, where the sign of XMCD is negative (positive) for L 3 ( L 2 ) edge 25 , 26 . The peak intensity of this XMCD signal is approximately 0.2–0.4% of the absorption.…”

Section: Resultscontrasting

confidence: 57%

“…The peak intensity of this XMCD signal is approximately 0.2–0.4% of the absorption. This value is small compared with that of typical 3 d ferromagnetic metals (10–20% of XAS) 25 , 26 . However, as discussed below, the XMCD signal in Mn 3 Sn is still too large to be explained by the small spontaneous magnetization of Mn 3 Sn, whereas the XMCD response of typical collinear antiferromagnet is almost absent 27 .…”

Section: Resultsmentioning

confidence: 75%

“…XMCD signal is obtained from the difference between the right and left circularly polarized X-ray absorptions. XAS shows a typical characteristic of metallic Mn compound 25 , 26 , where broad absorption peaks with no clear multiplet structures are observed, indicating the formation of dispersive itinerant bands of Mn d orbitals. As seen in Fig.…”

Section: Resultsmentioning

confidence: 99%

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X-ray study of ferroic octupole order producing anomalous Hall effect

et al. 2021

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Recently found anomalous Hall, Nernst, magnetooptical Kerr, and spin Hall effects in the antiferromagnets Mn3X (X = Sn, Ge) are attracting much attention for spintronics and energy harvesting. Since these materials are antiferromagnets, the origin of these functionalities is expected to be different from that of conventional ferromagnets. Here, we report the observation of ferroic order of magnetic octupole in Mn3Sn by X-ray magnetic circular dichroism, which is only predicted theoretically so far. The observed signals are clearly decoupled with the behaviors of uniform magnetization, indicating that the present X-ray magnetic circular dichroism is not arising from the conventional magnetization. We have found that the appearance of this anomalous signal coincides with the time reversal symmetry broken cluster magnetic octupole order. Our study demonstrates that the exotic material functionalities are closely related to the multipole order, which can produce unconventional cross correlation functionalities.

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Section: Resultscontrasting

confidence: 57%

Section: Resultsmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 99%

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X-ray study of ferroic octupole order producing anomalous Hall effect

et al. 2021

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“…Since the orbital part of the atomic wavefunction interacts with the circularly polarised X-rays [181], which indirectly interact with the spins of the atoms through the spin-orbit interaction [182], non-zero XMCD signals can be observed in the vicinity of the L 2 and L 3 edges. By applying the sum rules [181][182][183] after relevant background subtraction, element specific spin magnetic moments per atom m spin are estimated as listed in Table 4.…”

Section: X-ray Magnetic Circular Dichroismmentioning

confidence: 99%

“…The first-generation spintronic devices are based on magnetoresistive (MR) junctions, which have been used very widely [ 3 , 4 ], e.g ., a read head in a hard disk drive (HDD) [ 5 ] and a cell in a magnetic random access memory (MRAM) [ 6 ]. The critical measure of efficient magnetic transport in these devices is an MR ratio, which is defined by 152 170 183 289 359 360 361 367 367 384 382 383 348 349 …”

Section: Introductionmentioning

confidence: 99%

Heusler alloys for spintronic devices: review on recent development and future perspectives

Elphick

Frost

Samiepour

et al. 2021

Science and Technology of Advanced Materials

231

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Heusler alloys are theoretically predicted to become half-metals at room temperature (RT). The advantages of using these alloys are good lattice matching with major substrates, high Curie temperature above RT and intermetallic controllability for spin density of states at the Fermi energy level. The alloys are categorised into half- and full-Heusler alloys depending upon the crystalline structures, each being discussed both experimentally and theoretically. Fundamental properties of ferromagnetic Heusler alloys are described. Both structural and magnetic characterisations on an atomic scale are typically carried out in order to prove the half-metallicity at RT. Atomic ordering in the films is directly observed by X-ray diffraction and is also indirectly probed via the temperature dependence of electrical resistivity. Element specific magnetic moments and spin polarisation of the Heusler alloy films are directly measured using X-ray magnetic circular dichroism and Andreev reflection, respectively. By employing these ferromagnetic alloy films in a spintronic device, efficient spin injection into a non-magnetic material and large magnetoresistance are also discussed. Fundamental properties of antiferromagnetic Heusler alloys are then described. Both structural and magnetic characterisations on an atomic scale are shown. Atomic ordering in the Heusler alloy films is indirectly measured by the temperature dependence of electrical resistivity. Antiferromagnetic configurations are directly imaged by X-ray magnetic linear dichroism and polarised neutron reflection. The applications of the antiferromagnetic Heusler alloy films are also explained. The other non-magnetic Heusler alloys are listed. A brief summary is provided at the end of this review.

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Electronic structure and x-ray magnetic circular dichroism in the Heusler alloy Co2MnGe

Antonov

Jepsen

Yaresko

et al. 2006

Journal of Applied Physics

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The electronic structure and x-ray magnetic circular dichroism (XMCD) spectra of the Heusler alloy Co2MnGe were investigated theoretically from first principles, using the fully relativistic Dirac linear muffin-tin orbital band structure method. Densities of valence states, orbital and spin magnetic moments, as well as polarization of the electronic states at the Fermi level are analyzed and discussed. The origin of the XMCD spectra in the Co2MnGe compound is examined. The calculated results are compared with available experimental data.

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Orbital magnetic moment of “half-metallic” Co2MnGe

Cited by 6 publications

References 13 publications

X-ray study of ferroic octupole order producing anomalous Hall effect

X-ray study of ferroic octupole order producing anomalous Hall effect

Heusler alloys for spintronic devices: review on recent development and future perspectives

Electronic structure and x-ray magnetic circular dichroism in the Heusler alloy Co2MnGe

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