Orbital magnetism in Fe, Co, and Ni

Eriksson, Olle; Johansson, Börje; Albers, R. C.; Boring, A. M.; Brooks, M. S. S.

doi:10.1103/physrevb.42.2707

Cited by 257 publications

(108 citation statements)

References 18 publications

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“…Well-defined hard-axis loop behavior is shown with an anisotropy field H K of 11.8 ± 1.0 Oe (Fig 2, right); the Fe dichroism signal is roughly a factor of two larger than the Ni dichroism signal, consistent with previous work [13] and the smaller number of holes in Ni.…”

Section: Methodssupporting

confidence: 88%

Precessional dynamics of elemental moments in a ferromagnetic alloy

et al. 2004

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We demonstrate an element-specific measurement of magnetization precession in a metallic ferromagnetic alloy, separating Ni and Fe moment motion in Ni 81 Fe 19 . Pump-probe X-ray magnetic circular dichroism (XMCD), synchronized with short magnetic field pulses, is used to measure free magnetization oscillations up to 2.6 GHz with elemental specificity and a rotational resolution of < 2 • . Magnetic moments residing on Ni sites and Fe sites in a Ni 81 Fe 19 (50nm) thin film are found to precess together at all frequencies, coupled in phase within instrumental resolution of 90 ps.

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Section: Methodssupporting

confidence: 88%

Precessional dynamics of elemental moments in a ferromagnetic alloy

et al. 2004

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“…We used atomic spheres with a radius of 0.124 nm for all the atoms. For 3d transition metals, the agreement between the magnetic moments calculated with codes based on the density functional theory (DFT) and measured experimentally is in general better for the spin than for the orbital magnetic moments [90]. This can be seen from the calculated magnetic moments of bulk fcc Ni and hcp Co described in Tables 2 and 3.…”

Section: -First-principle Calculations Of the Spin And Orbital Magnetmentioning

confidence: 81%

“…The orbital moments are indeed usually underestimated by DFT-based codes, which do not always allow recovering the orbital configuration predicted by the second empirical Hund's rule [91]. Eriksson et al [90] have proposed to add an orbital polarization correction which mimics the second Hund's rule. This correction has given values of the orbital magnetic moments in agreement with experiments for bulk 3d transition metals [90].…”

Section: -First-principle Calculations Of the Spin And Orbital Magnetmentioning

confidence: 99%

“…Eriksson et al [90] have proposed to add an orbital polarization correction which mimics the second Hund's rule. This correction has given values of the orbital magnetic moments in agreement with experiments for bulk 3d transition metals [90]. The improvement due to the polarization correction is however less satisfactory for magnetic atoms at interfaces [92].…”

Section: -First-principle Calculations Of the Spin And Orbital Magnetmentioning

confidence: 99%

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Co/Ni(111) superlattices studied by microscopy, x-ray absorption, andab initiocalculations

et al. 2012

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We explore the origins of perpendicular magnetic anisotropy in epitaxial and textured Co/Ni (111) superlattices using a combination of thin film growth, structural characterization, x-ray magnetic circular dichroism (XMCD) and ab-initio calculations. Transmission electron microscopy and x-ray diffraction experiments allow us to show that the "bulk" magnetoelastic contribution to the total magnetic energy is small compared to the interface anisotropy. The magnetic properties are studied by using XMCD at the Co and Ni L 2,3 edges. Hysteresis loops performed at the Co L 3 edge confirm the perpendicular magnetization for Co thicknesses up to 4 monolayers. The spin and orbital moments were deduced using the XMCD sum rules. The results are explained by considering two kinds of magnetic moments for Co, distinguishing the interfaces from the rest of the layers. Both effective spin and orbital moments of Co atoms are found to be enhanced at the Co-Ni interfaces, whereas the magnetic moment of Co surrounded by Co is similar to the bulk values. Ab-initio calculations allow us to show a strong enhancement of the dipole operator contribution on Co atoms at the interface that is partly responsible for this high effective spin moment at the interface. Such a moment enhancement is not observed for Ni, the dipole operator contribution being close to zero. Finally, we observed a very surprising proportionality between the effective spin and orbital moments, independent of the absorption edge or deposition technique used. We assign this peculiar behavior to the fact that the magnetic dipole operator involved in the sum rules is closely linked to the increase of the Co orbital moment at the interface. Based on XMCD results obtained on both molecular beam epitaxy and sputter deposited samples, this link allows us to show the extreme sensitivity of the perpendicular anisotropy with the chemical ordering at the interface. 2

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“…We additionally performed spin-orbit coupling calculations using Wien2k, where we added an orbital polarization on Fe 3d instead of the on-site Coulomb interaction U . This approach with orbital polarization was applied successfully for bulk calculations of different transition metal atoms [43][44][45]. In our calculations this is the first time this approach is used on single atoms on a surface.…”

Section: Details Of Dft Calculationsmentioning

confidence: 99%

Origin of Perpendicular Magnetic Anisotropy and Large Orbital Moment in Fe Atoms on MgO

et al. 2015

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We report on the magnetic properties of individual Fe atoms deposited on MgO(100) thin films probed by x-ray magnetic circular dichroism and scanning tunneling spectroscopy. We show that the Fe atoms have strong perpendicular magnetic anisotropy with a zero-field splitting of 14.0 AE 0.3 meV=atom. This is a factor of 10 larger than the interface anisotropy of epitaxial Fe layers on MgO and the largest value reported for Fe atoms adsorbed on surfaces. The interplay between the ligand field at the O adsorption sites and spin-orbit coupling is analyzed by density functional theory and multiplet calculations, providing a comprehensive model of the magnetic properties of Fe atoms in a low-symmetry bonding environment.

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Orbital magnetism in Fe, Co, and Ni

Cited by 257 publications

References 18 publications

Precessional dynamics of elemental moments in a ferromagnetic alloy

Precessional dynamics of elemental moments in a ferromagnetic alloy

Co/Ni(111) superlattices studied by microscopy, x-ray absorption, andab initiocalculations

Origin of Perpendicular Magnetic Anisotropy and Large Orbital Moment in Fe Atoms on MgO

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