Experimental g′ and g Values of Fe, Co, Ni, and Their Alloys

Meyer, Andreas; Asch, G.

doi:10.1063/1.2000457

Cited by 140 publications

(59 citation statements)

References 8 publications

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“…It would be interesting to see for what cluster sizes the orbital moment reaches the (hcp) bulk value of 0.13 µ B /atom [50]. We speculate that a central atom in a cluster with nearest and next-nearest neighboring atoms will have a bulk like orbital moment.…”

Section: Spin Momentmentioning

confidence: 99%

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Correlation effects and orbital magnetism of Co clusters

et al. 2016

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Recent experiments on isolated Co clusters have shown huge orbital magnetic moments in comparison with their bulk and surface counterparts. These clusters hence provide the unique possibility to study the evolution of the orbital magnetic moment with respect to the cluster size and how competing interactions contribute to the quenching of orbital magnetism. We investigate here different theoretical methods to calculate the spin and orbital moments of Co clusters, and assess the performances of the methods in comparison with experiments. It is shown that density-functional theory in conventional local density or generalized gradient approximations, or even with a hybrid functional, severely underestimates the orbital moment. As natural extensions/corrections, we considered the orbital polarization correction, the LDA+U approximation as well as the LDA+DMFT method. Our theory shows that of the considered methods, only the LDA+DMFT method provides orbital moments in agreement with experiment, thus emphasizing the importance of dynamic correlations effects for determining fundamental magnetic properties of magnets in the nanosize regime.

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Section: Spin Momentmentioning

confidence: 99%

“…Here antiferromagnetic means that at some site(s) the magnetic moment is pointing in the opposite direction with respect to the other sites. For the reader's convience the experimentally observed orbital moment for the isolated atom and (hcp) bulk are 3 (for a d 7 configuration) and 0.13 µ B /atom [50]. …”

Section: A Spin and Orbital Moments From Gga And Lda+umentioning

confidence: 99%

Correlation effects and orbital magnetism of Co clusters

et al. 2016

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“…This formula can be extended to alloys and compounds [27], and the effective g factor g eff in the case of Py reads…”

Section: X-ray Magnetic Circular Dichroismmentioning

confidence: 99%

“…The deviation of the g factor from the free-electron value is proportional to ξ/ , where is the ground state-first excited state splitting of the corresponding 3d ion, and therefore reflects the strength of the SOI. For small orbital contributions it can be expressed as [27] …”

Section: X-ray Magnetic Circular Dichroismmentioning

confidence: 99%

Spin-orbit interaction enhancement in permalloy thin films by Pt doping

et al. 2016

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The spin-orbit interaction is an inherent part of magnetism, which links up the independent world of spins to the atomic lattice, thus controlling many functional properties of magnetic materials. In the widely used 3d transition metal ferromagnetic films, the spin-orbit interaction is relatively weak, due to low atomic number. Here we show that it is possible to enhance and tune the spin-orbit interaction by adding 5d platinum dopants into permalloy (Ni 81 Fe 19 ) thin films by a cosputtering technique. This is achieved without significant changes of the magnetic properties, due to the vicinity of Pt to meeting the Stoner criterion for the ferromagnetic state. The spin-orbit interaction is investigated by means of transport measurements (the anisotropic magnetoresistance and anomalous Hall effect), ferromagnetic resonance measurements to determine the Gilbert damping, as well as by measuring the x-ray magnetic circular dichroism at the L 3 and L 2 x-ray absorption edges to reveal the ratio of orbital to spin magnetic moments. It is shown that the effective spin-orbit interaction increases with Pt concentration within the 0%-10% Pt concentration range in a way that is consistent with theoretical expectations for all four measurements.

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“…For example, in the case of Ni, Co and Fe, the OM is only a few percent of the total magnetization. 22 However, in systems with topologically nontrivial band structures, a large OM is expected on electron states near the Dirac point. 23 Similarly, theoretical and experimental work on strong Rashba systems has shown the appearance of OM generated by electron states near the Dirac-like anticrossing point of the Rashba states.…”

Section: Introductionmentioning

confidence: 99%

Unexpected orbital magnetism in Bi-rich Bi2Se3 nanoplatelets

Kim

Katsiotis²,

Alhassan³

et al. 2016

NPG Asia Mater

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The discovery of two-dimensional electron gas states with giant Rashba spin splitting (RSS) in electron-doped three-dimensional topological insulators (TIs) uncovered new fascinating physics and raised hopes for novel spintronic devices. Significant challenges, including synthetic constraints and control of the magnetic properties, must be addressed before any breakthroughs are possible. Here, we show how RSS in Bi-rich Bi 2 Se 3 nanoplatelets is responsible for the appearance of remarkable orbital magnetic properties, as observed using magnetization and conduction electron spin resonance experiments and confirmed by theoretical simulations. In view of the strong spin-orbit coupling (SOC) and the proximity to the TI surface states, this discovery enlightens fundamental aspects of SOC-based functionalities of TI materials with aims for future applications.

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Experimental g′ and g Values of Fe, Co, Ni, and Their Alloys

Cited by 140 publications

References 8 publications

Correlation effects and orbital magnetism of Co clusters

Correlation effects and orbital magnetism of Co clusters

Spin-orbit interaction enhancement in permalloy thin films by Pt doping

Unexpected orbital magnetism in Bi-rich Bi2Se3 nanoplatelets

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