Structure and perpendicular magnetization of Fe/Ni(111) bilayers on W(110)

Sander, Dirk; Enders, Axel; Schmidthals, C.; Kirschner, J.; Johnston, Hamish; Arnold, Christophe; Venus, D.

doi:10.1063/1.365532

Cited by 32 publications

(20 citation statements)

References 7 publications

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“…Fe and Ni film thickness was calibrated by monitoring low-energy electron microscopy (LEEM) image intensity oscillations associated with atomic layer-by-layer growth. Fe and Ni layers were grown at 300 K by electron beam evaporation, and the sample was annealed to 900 K for several minutes after growth of one monolayer Ni to develop a well-ordered interface 24,25 .…”

Section: Methodsmentioning

confidence: 99%

“…We focus on Fe/Ni bilayer grown on W(110) substrates, where the very large spin Hall angle of tungsten 23 is combined with two-fold symmetry at the (110) interface and perpendicular magnetic anisotropy of the magnetic layer [24][25][26] . Using spin-polarized low-energy electron microscopy (SPLEEM) [27][28][29] , we observe anisotropic chiral DW spin structures with mixed components of chiral Bloch-and chiral Néel-character.…”

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confidence: 99%

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Unlocking Bloch-type chirality in ultrathin magnets through uniaxial strain

et al. 2015

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Chiral magnetic domain walls are of great interest because lifting the energetic degeneracy of left-and right-handed spin textures in magnetic domain walls enables fast current-driven domain wall propagation. Although two types of magnetic domain walls are known to exist in magnetic thin films, Bloch-and Néel-walls, up to now the stabilization of homochirality was restricted to Néel-type domain walls. Since the driving mechanism of thin-film magnetic chirality, the interfacial Dzyaloshinskii-Moriya interaction, is thought to vanish in Bloch-type walls, homochiral Bloch walls have remained elusive. Here we use real-space imaging of the spin texture in iron/nickel bilayers on tungsten to show that chiral domain walls of mixed Bloch-type and Néel-type can indeed be stabilized by adding uniaxial strain in the presence of interfacial Dzyaloshinskii-Moriya interaction. Our findings introduce Bloch-type chirality as a new spin texture, which may open up new opportunities to design spin-orbitronics devices.

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Section: Methodsmentioning

confidence: 99%

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confidence: 99%

Unlocking Bloch-type chirality in ultrathin magnets through uniaxial strain

et al. 2015

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“…However, Fe films grown on different Cu surfaces have been found to show different growth modes and different ranges of thicknesses in which the ferromagnetic fcc phase with out-of-plane anisotropy persists. Ni is another suitable material due to the small lattice mismatch of +2%, referred to the room temperature lattice parameter of fcc Fe, extrapolated from the high-temperature phase [8,9,10,11,12]. It was shown [8,10] that Fe layer on top Ni(111)/W(110) induces perpendicular to the film magnetic anisotropy for 0.5 − 3 ML thick iron films.…”

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confidence: 99%

“…Ni is another suitable material due to the small lattice mismatch of +2%, referred to the room temperature lattice parameter of fcc Fe, extrapolated from the high-temperature phase [8,9,10,11,12]. It was shown [8,10] that Fe layer on top Ni(111)/W(110) induces perpendicular to the film magnetic anisotropy for 0.5 − 3 ML thick iron films. At higher Fe coverages, an in-plane magnetization was found, which is proposed to be caused by the fcc to bcc transition in the Fe layer around 4 ML thickness of iron film.…”

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confidence: 99%

Graphene-protected iron layer on Ni(111)

Dedkov

Fonin

Rüdiger

et al. 2008

Applied Physics Letters

153

141

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Here we report the photoemission studies of intercalation process of Fe underneath graphene layer on Ni(111). The process of intercalation was monitored via XPS of corresponding core levels and UPS of the graphene-derived π states in the valence band. fcc-Fe films with thickness of 2-5 monolayers at the interface between graphene and Ni(111) form epitaxial magnetic layer passivated from the reactive environment, like for example oxygen gas.

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“…Prior to the SPEELS measurements, the structural, chemical and magnetic properties were checked by means of low energy electron diffraction, Auger electron spectroscopy and magneto optical Kerr effect measurements. The Fe films reveal the expected structural and magnetic properties well-known from literature [24][25][26]. The SPEELS measurements were performed using our high performance spectrometer with an energy resolution well below 20 meV and a beam polarization of about 70±10% [27].…”

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confidence: 99%

Asymmetric Spin-Wave Dispersion on Fe(110): Direct Evidence of the Dzyaloshinskii-Moriya Interaction

et al. 2010

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The influence of the Dzyaloshinskii-Moriya interaction on the spin-wave dispersion in an Fe double-layer grown on W(110) is measured for the first time. It is demonstrated that the Dzyaloshinskii-Moriya interaction breaks the degeneracy of spin-waves and leads to an asymmetric spin-wave dispersion relation. An extended Heisenberg spin Hamiltonian is employed to obtain the longitudinal component of the Dzyaloshinskii-Moriya vectors from the experimentally measured energy asymmetry. [5,6] and multiferroics [7,8].In nanomagnetism, where the surface effects are noticeable, the spin-orbit coupling is one of the most important intrinsic magnetic perturbations, which creates novel phenomena. Recently, it has been shown that a strong spin-orbit coupling in the presence of the broken inversion symmetry at the surface leads to the DM interaction, which stabilizes a noncollinear spin structure for a Mn monolayer on W(110) [9] and W(100) [10] surfaces.An ultrathin Fe film grown on W(110) is another system that is believed to show the DM interaction [11][12][13]. Magnetic excitations in this quasi-two-dimensional spin system have been studied theoretically since many years [14][15][16][17][18][19][20][21]. In the description of the collective magnetic excitations, only the symmetric exchange interaction was considered and the DM interaction has been neglected. In such systems, where DM interaction is relatively large, it should, in principle, change the intrinsic properties of the spin-waves (SWs). Only very recently, the influence of the DM interaction on the spin-wave dispersion has been predicted to give rise to an asymmetric spin-wave dispersion in an Fe monolayer on W(110) [22]. However, the effect of the DM interaction on the spin-wave dispersion in low dimensional systems has never been measured experimentally.In this Letter we report the first experimental evidence of the influence of DM interaction on the spin-wave dispersion in a double-layer Fe. We show that in the presence of the DM interaction the spin-wave dispersion is asymmetric. By measuring the highly resolved spin polarized electron energy loss (SPEEL) spectra in both energy loss and gain regimes and by reversing the magnetization of the film, we measure the DM interaction driven asymmetry in the spin-wave dispersion of Fe double-layer grown on W(110). By using an extended Heisenberg spin Hamiltonian, the energy asymmetry is modeled giving rise to a quantitative determination of the longitudinal components of DM vectors.The iron layer was deposited onto a clean W(110) single crystal at room temperature (RT). Special care has been taken concerning the cleaning of the W crystal as described elsewhere [23]. Prior to the SPEELS measurements, the structural, chemical and magnetic properties were checked by means of low energy electron diffraction, Auger electron spectroscopy and magneto optical Kerr effect measurements. The Fe films reveal the expected structural and magnetic properties well-known from literature [24][25][26]. The SPEELS measurements were perf...

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Structure and perpendicular magnetization of Fe/Ni(111) bilayers on W(110)

Cited by 32 publications

References 7 publications

Unlocking Bloch-type chirality in ultrathin magnets through uniaxial strain

Unlocking Bloch-type chirality in ultrathin magnets through uniaxial strain

Graphene-protected iron layer on Ni(111)

Asymmetric Spin-Wave Dispersion on Fe(110): Direct Evidence of the Dzyaloshinskii-Moriya Interaction

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