Sign reversal of the orbital moment via ligand states

Galanakis, I.; Oppeneer, Peter M.; Ravindran, P.; Nordström, Lars; James, P.; Alouani, M.; Eriksson, Olle

doi:10.1103/physrevb.63.172405

Cited by 40 publications

(36 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The large effect on the Mn orbital moment in the case of the 5d atoms has been already discussed in Ref. 30, where using perturbation theory it was shown that the large spin-orbit coupling of the 5d elements has a large effect on the orbital moment of the 3d neighboring atoms in the case of alloys.…”

Section: 29mentioning

confidence: 95%

“…The latter rule, although derived for atoms, stands also for solids with few exceptions. 30 It states that if the d band is more than half-filled (Mn has 7 d-electrons) then the spin and orbital moments should be parallel. Increasing the valence of the X atom by one electron either following the 3d series (Fe→Co→Ni→Cu) or the 4d series (Rh→Pd→Ag) only scarcely changes the Mn orbital moment while there are significant variations in the value of the Mn spin moment.…”

Section: 29mentioning

confidence: 99%

See 1 more Smart Citation

Orbital magnetism in the half-metallic Heusler alloys

Galanakis

2005

Phys. Rev. B

Self Cite

178

View full text Add to dashboard Cite

Using the fully-relativistic screened Korringa-Kohn-Rostoker method I study the orbital magnetism in the half-metallic Heusler alloys. Orbital moments are almost completely quenched and they are negligible with respect to the spin moments. The change in the atomic-resolved orbital moments can be easily explained in terms of the spin-orbit strength and hybridization effects. Finally I discuss the orbital and spin moments derived from X-ray magnetic circular dichroism experiments.PACS numbers: 71.20. Be, 71.20.Lp, 75.50.Cc Introduction. Half-metallic ferromagnets consist a new class of materials which attracted a lot of attention due to their possible applications in spintronics.1 In these materials the two spin bands have a completely different behavior. While the majority spin band (referred also as spin-up band) shows the typical metallic behavior, the minority spin band (spin-down band) is semiconducting. The spinpolarization at the Fermi level is 100% and these compounds could maximize the efficiency of the magnetoelectronic devices.

show abstract

Section: 29mentioning

confidence: 95%

Section: 29mentioning

confidence: 99%

Orbital magnetism in the half-metallic Heusler alloys

Galanakis

2005

Phys. Rev. B

Self Cite

178

View full text Add to dashboard Cite

show abstract

“…29 They nicely described how the spin-orbit (SO) in Au may influence the orbit in V atoms through hybridization, provoking the reversal of its orbital moment and, therefore, the breakdown of the mentioned rule. Subsequent works on metallic compounds make use of this interpretation to demonstrate that the strong hybridization between the different atoms in the magnetic compounds is the key factor of such a breakdown.…”

Section: Discussionmentioning

confidence: 99%

Breakdown of Hund's third rule in amorphous Co-W nanoparticles and crystalline Co3W alloys

Figueroa

Bartolomé

et al. 2012

Phys. Rev. B

View full text Add to dashboard Cite

We present x-ray absorption near edge structure (XANES) and x-ray magnetic circular dichroism (XMCD) measurements performed at the Co K and W L 2,3 edges, on amorphous Co-W alloy nanoparticles, and a comparison with those on a bulk Co 3 W alloy. A strong hybridization between the 4p and 3d orbitals in Co and the 5d band in W are observed, resulting in an induced magnetic moment in the W atoms. The orbital to spin moment ratio in W of all these Co-W systems is positive, suggesting a parallel orientation of the two moments. This is opposite to the expected antiparallel coupling for atoms with a less-than-half-filled 5d band, according to Hund's third rule. These findings are supported by calculations of the electronic density of states projected at the Co 3d and W 5d orbitals, as well as XANES spectra and XMCD signals at the Co K and W L 2,3 edges in a Co 3 W system.

show abstract

“…Only when the atomic character becomes appreciably modified due to strong hybridizations, the third Hund's rule might not be fulfilled, which is an exceptionally rare event. 32 The changes of the EDC's with the Cr concentration is accompanied by a change in magnetism: the Cr-rich alloys are antiferromagnetic, whereas CrPt 3 is ferrimagnetic ͑i.e., in the ordered phase, the Cr-Cr pairs couple ferromagnetically, while Cr-Pt pairs couple antiferromagnetically, as determined by neutron scattering 33,34 ͒. The weight of the hybridized states is strongly increased at the expense of the mainly Crderived states near the Fermi level.…”

Section: Resultsmentioning

confidence: 99%

Effects of the stoichiometry and chemical order on the electronic structure and magnetic properties of Cr-Pt alloys probed by angular-resolved photoemission

et al. 2002

Self Cite

View full text Add to dashboard Cite

The electronic structure of the intermetallic compound CrPt 3 is studied by angle-resolved ultraviolet photoemission spectroscopy on ͑001͒ and ͑111͒ surfaces of molecular-beam-epitaxy-grown epitaxial films in the photon energy range of 21-150 eV. The surface structures and the chemical order are investigated by reflecting high-energy electron diffraction. The partial density of states of CrPt 3 has been estimated using the photoionization dependence of the photoemission. The momentum dependence of the valence-band energies is determined for the ⌫-R bulk high-symmetry line and the ⌫-M and RϪX directions using synchrotron radiation. The nature of these bands was identified by a comparison with band-structure calculations based on densityfunctional theory in the local spin-density approximation. A good agreement between measured and ab initio calculated energy bands is found. Band mapping has also been performed using the angle-variation method on ͑001͒ surfaces excited by the He I emission line. For variations of the degree of surface order, a simple relationship between the electronic structure and magnetic properties of the alloy is found, which is discussed in terms of a modeled band structure. The magnetic anisotropy of this alloy is found to relate to the density of states at the Fermi level as determined by photoemission.

show abstract

Sign reversal of the orbital moment via ligand states

Cited by 40 publications

References 20 publications

Orbital magnetism in the half-metallic Heusler alloys

Orbital magnetism in the half-metallic Heusler alloys

Breakdown of Hund's third rule in amorphous Co-W nanoparticles and crystalline Co3W alloys

Effects of the stoichiometry and chemical order on the electronic structure and magnetic properties of Cr-Pt alloys probed by angular-resolved photoemission

Contact Info

Product

Resources

About