Anomalous magnetic anisotropy in ultrathin transition metals

Engel, Brad N.; Wiedmann, Michael H.; Leeuwen, Robert A. Van; Falco, Charles M.

doi:10.1103/physrevb.48.9894

Cited by 94 publications

(50 citation statements)

References 20 publications

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“…The second point can be at first sight surprising because it contradicts several results on Co/Pt(111) [43,44,[59][60][61][62] and on multilayered Co/Pt [14,45,63] and Co/Pd [64][65][66] films all showing out-of-plane anisotropy. However, three theoretical works show the ideal Co monolayer on Pt(111) [42,67] and Pd(111) [68] to have in-plane anisotropy, the later result having been experimentally proofed [69].…”

Section: Quantifying the Contribution Of Perimeter Vs Surface Atoms mentioning

confidence: 68%

“…A similar increase of the perpendicular anisotropy is produced by capping layers because polarization can be induced at the new interface [69,72,73]. For example it has been demonstrated that the inplane magnetization of 6 ML Co/Pd(111) turns to be out-of-plane after capping it with about 2 ML of Cu [65]. All these effects are absent in our sample since the islands were grown at low temperature and then shortly annealed in order to prevent exchange mechanisms, the islands are flat and they are observed in situ without the use of capping layers.…”

Section: Quantifying the Contribution Of Perimeter Vs Surface Atoms mentioning

confidence: 96%

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Magnetic anisotropy from single atoms to large monodomain islands of Co/Pt(111)

Gambardella

Rusponi

Cren

et al. 2005

Comptes Rendus. Physique

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By studying the magnetic behavior of self-assembled Co islands on a single-crystal metal surface, Pt(111), we show how the magnetic anisotropy evolves from isolated atoms to monolayer islands and films. Single Co adatoms are found to have a giant magnetocrystalline anisotropy energy of E a = 9.3 ± 1.6 meV/atom arising from the combination of partly preserved orbital moments (m L = 1.1 µ B ) and strong spin-orbit coupling induced by the Pt substrate. Combined scanning tunneling microscopy and X-ray magnetic circular dichroism experiments performed for differently sized small two-dimensional Co islands establish a clear connection between E a and m L , both quantities decrease sharply with the lateral coordination of the magnetic atoms. In accordance with this, Kerr magnetometry experiments, again performed in conjunction with scanning tunneling microscopy, reveal that the anisotropy energy of large two-dimensional Co islands is almost entirely determined by the relatively low number of perimeter atoms, having E a = 0.9 ± 0.1 meV/atom. These results confirm theoretical predictions and are of fundamental value the understanding of how the magnetic anisotropy develops in finite-size magnetic particles. Identification of the role of perimeter and surface atoms opens up new opportunities for engineering the anisotropy and the moment of a magnetic nanostructure. RésuméAnisotropie magnétique de l'atome isolé aux îlots monocouches de Co/Pt(111). En étudiant les propriétés magnétiques de particules de Co auto assemblées sur une surface d'orientation (111) d'un monocristal de Pt, nous montrons comment l'anisotropie magnétique évolue de l'atome isolé aux îlots monocouches et aux films ultraminces. Nous trouvons que les atomes de Co isolés adsorbés en surface ont une énergie d'anisotropie magnétocrystalline de E a = 9.3 ± 1.6 meV/atome provenant de la combinaison d'un moment orbital conservé (m L = 1.1 µ B ) et d'un fort couplage spin-orbite induit par le substrat de Pt. Des expériences combinées de microscopie à effet tunnel et de dichroïsme circulaire magnétique à rayons X, effectués sur des îlots de Co de petit taille établissent une connexion claire entre E a et m L , chacune de ces quantités décroissant rapidement avec la coordination latérale des atomes magnétiques. En conformité avec ceci, nous trouvons en employant la magnétométrie par effet Kerr et le microscope à effet tunnel que l'énergie d'anisotropie de grands îlots bidimensionnels de Co est presque entiè-rement déterminée par le nombre relativement faible d'atomes au périmètre, ayant E a = 0.9 ± 0.1 meV/atome. Ces résultats confirment les prédictions théoriques et sont d'un intérêt fondamental pour comprendre comment l'anisotropie magnétique se développe dans les particules magnétiques de taille finie. L'identification du rôle des atomes au périmètre et des atomes de surface ouvre de nouvelles opportunités pour l'ingénierie de l'anisotropie et du moment de nanostructures magnétiques. Pour citer cet article : P. Gambardella et al., C. R. Physique 6 (200...

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Section: Quantifying the Contribution Of Perimeter Vs Surface Atoms mentioning

confidence: 68%

Section: Quantifying the Contribution Of Perimeter Vs Surface Atoms mentioning

confidence: 96%

Magnetic anisotropy from single atoms to large monodomain islands of Co/Pt(111)

Gambardella

Rusponi

Cren

et al. 2005

Comptes Rendus. Physique

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“…Oscillations of the magnetic anisotropy and the Kerr rotation angle in magnetic films covered by non-magnetic overlayers have been reported [8,9]. It has been also experimentally found that the Curie temperature, ground state magnetic moment, and spin wave stiffness parameter are the oscillatory functions of the thickness of non-magnetic layer [10].…”

Section: Introductionmentioning

confidence: 93%

Magnetic Characteristics of the System of Exchange Coupled Layers

Urbaniak-Kucharczyk

Machowski

2000

Acta Phys. Pol. A

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“…Crystalline PMA materials, for example, Co-and Fe-based superlattice systems such as Co/Pd, Co/Pt, and Fe/Au, are actively investigated. [11][12][13][14][15][16][17] Compared to the crystalline PMA materials, amorphous PMA materials have major advantages in two aspects. 18,19 First, there are less grain boundaries, which act as domain wall pinning sites during the magnetization reversal process.…”

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confidence: 99%

Perpendicular magnetic anisotropic characteristics of amorphous [CoSiB/Pt]N multilayers

Heijden

Lee

Choi

et al. 2013

Applied Physics Letters

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The perpendicular magnetic anisotropic properties of amorphous multilayers of [CoSiB/Pt]N are investigated as functions of the thickness of magnetic layers (tCoSiB = 4 and 6 Å) and the number of repeated bilayers (N = 3 ∼ 20). Even though the magnetization reversal process is dominated by the wall motion of magnetic domains rather than the nucleation for all the values of tCoSiB and N in our experiment, the changes of magnetic properties are strongly dependent on the tCoSiB and N values. The effective anisotropy constant for the 6 Å sample is K1eff = 1.2 × 106 erg/cm3, which is a factor of 6 larger than that for the 4 Å sample. The coercivity variations as a function of N are explained by the Ruderman-Kittel-Kasuya-Yosida (RKKY) coupling between the magnetic layers considering the balance of domain wall energy and magnetostatic energy.

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Anomalous magnetic anisotropy in ultrathin transition metals

Cited by 94 publications

References 20 publications

Magnetic anisotropy from single atoms to large monodomain islands of Co/Pt(111)

Magnetic anisotropy from single atoms to large monodomain islands of Co/Pt(111)

Magnetic Characteristics of the System of Exchange Coupled Layers

Perpendicular magnetic anisotropic characteristics of amorphous [CoSiB/Pt]N multilayers

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