Isolating the Step Contribution to the Uniaxial Magnetic Anisotropy in Nanostructured<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Fe</mml:mi><mml:mo>/</mml:mo><mml:mi>Ag</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>001</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>Films

Bisio, Francesco; Moroni, R.; Mongeot, F. Buatier de; Canepa, M.; Mattera, L.

doi:10.1103/physrevlett.96.057204

Cited by 71 publications

(40 citation statements)

References 27 publications

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“…Of importance for the interaction at the Fe-Pt interface is the hybridization between Fe 3d and Pt 5d states, as has been discussed by several authors for various Fe-Pt systems. [28][29][30]47 Our element specific XMCD measurements indeed reveal a dichroic signal at the Pt N 7,6 edge in FePt surface monolayers and will be published elsewhere. The Fe polarizes the surrounding Pt atoms which then, owing to their large spin-orbit interaction, significantly contribute to the magnetocrystalline anisotropy ͑MAE͒ of the whole film-substrate system.…”

Section: Discussionmentioning

confidence: 79%

“…[1][2][3][4][5][6][7][8] To account for the dependence of the magnetism of epitaxial films on electronic and structural film properties, phenomenological quantities, such as magnetocrystalline, magnetoelastic, interface, or step anisotropy energies have been introduced and applied successfully during the past 2 decades of research. 3,7,[9][10][11][12][13] These parameters are chosen to reflect the symmetry of the observed magnetic anisotropy and usually hide details of the sample structure. The immense effort in determining such anisotropy contributions experimentally has partly distracted from gaining a better understanding of the role of the local atomic structure itself.…”

Section: Introductionmentioning

confidence: 99%

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Structure and magnetism of atomically thin Fe layers on flat and vicinal Pt surfaces

et al. 2006

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Ultrathin Fe films on Pt substrates have been investigated under ultrahigh vacuum conditions by scanning tunneling microscopy, low energy electron diffraction, magneto-optical Kerr effect, x-ray magnetic circular dichroism measurements, and Kerr microscopy. We present a comparison between Fe films on flat Pt͑111͒ and stepped Pt͑997͒, with particular focus on the magnetic anisotropy in the submonolayer thickness range below 0.2 monolayer coverage, and above the spin reorientation transition at 3 monolayer thickness. The comparison of structure and magnetism suggests that the perpendicular easy axis found for films thinner than three monolayers is due to dominating contributions from both film interfaces to the anisotropy energy. The Fe-Pt interface contribution has its origin in the hybridization of the Fe 3d with the Pt 5d band. The in-plane magnetic anisotropy above 3 atomic layers film thickness can be correlated directly with peculiarities of the film structure.

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Section: Discussionmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Structure and magnetism of atomically thin Fe layers on flat and vicinal Pt surfaces

et al. 2006

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“…This contribution is called the step-induced magnetic anisotropy K step [28], which is characterized by a change in the shape of the magnetization curve. This effect has been experimentally observed, such as the systems of Ni/Fe/Ag(001) [172], Fe/Ag(001) [173,174], Fe/W(001) [175,176], Co/Cu (1113) [177].…”

Section: When Films Have the Same Two Surfaces Or Interfaces Eq (46mentioning

confidence: 94%

Size Dependence of Structures and Properties of Magnetic Materials

Jiang¹,

Lang²

2007

TONANOJ

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Due to the involvement of high portion of atomic coordination imperfection in surfaces and interfaces, the properties of magnetic nanocrystals dramatically differ from that of the corresponding bulk counterparts, which have led to a surge in both experimental and theoretical investigations in the past decades. This review summarizes the studies for these size-dependent magnetic properties, and additional thermal or phase stabilities, and mechanical properties. To interpret the above phenomena, a thermodynamic model for the size dependence and interface dependences of these properties is described, which is based on Lindemann s criterion for melting, Mott s expression for the vibrational melting entropy, and Shi s model for the size-dependent melting temperature. The model without any adjustable parameter is confirmed by a large number of experimental results, and helps us to understand the structures and properties of the magnetic nanocrystals. Moreover, other theoretical works on the above properties are also mentioned and commented.

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“…The sputtering results in the development of nanoscale surface ripples, giving rise to an in-plane uniaxial magnetic anisotropy (UMA) with controllable orientation and strength through the sputtering conditions [5][6][7][8][9]. Bisio et al employed ion beam sputtering to achieve step-induced UMA in Fe films on flat Ag (001) substrates [10]. Liedke et al engineered the UMA of ferromagnetic thin films without affecting the intrinsic cubic anisotropy by creating nanoscale ripples on various substrates prior to the film deposition [11,12].…”

Section: Introductionmentioning

confidence: 99%

Tailoring the magnetic anisotropy, magnetization reversal, and anisotropic magnetoresistance of Ni films by ion sputtering

et al. 2015

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We studied surface morphology induced changes of magnetic anisotropy, magnetization reversal, and symmetry of the anisotropic magnetoresistance (AMR) in ion sputtered Ni films grown on MgO (001). Grazing-incidence ion sputtering generally develops anisotropic surface roughness of the Ni films, i.e., nanometer wide ripples parallel to the ion beam direction, giving rise to uniaxial magnetic anisotropy with the easy axis along the ion beam direction. The formed ripples act as domain wall nucleation and pinning sites during magnetization reversal, while two-jump domain wall motion dominates in the as-grown Ni films. More importantly, the azimuthal angular dependence of the AMR indicates a superposition of twofold symmetry and fourfold symmetry. By relying on grazing-incidence ion sputtering along specific crystallographic directions, we are able to tailor the relative weight of twofold and fourfold symmetry of AMR. We demonstrate that in contrast to the bulk case, the symmetry of the AMR becomes also sensitive to the surface morphology in thin films, which is in particular relevant for the design of magnetotransport based sensors.

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Isolating the Step Contribution to the Uniaxial Magnetic Anisotropy in NanostructuredFe/Ag(001)Films

Cited by 71 publications

References 27 publications

Structure and magnetism of atomically thin Fe layers on flat and vicinal Pt surfaces

Structure and magnetism of atomically thin Fe layers on flat and vicinal Pt surfaces

Size Dependence of Structures and Properties of Magnetic Materials

Tailoring the magnetic anisotropy, magnetization reversal, and anisotropic magnetoresistance of Ni films by ion sputtering

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