Stress and structure of Ni monolayers on W(110): The importance of lattice mismatch

Sander, Dirk; Schmidthals, C.; Enders, Axel; Kirschner, J.

doi:10.1103/physrevb.57.1406

Cited by 68 publications

(72 citation statements)

References 27 publications

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“…Further adsorption results in quasi-van-der-Merwe growth up to ∼3 Ni overlayers [at room temperature (RT)]. More recently, scanning tunneling microscopy (STM) has been utilized to investigate this interface; the STM measurements confirm the results of the earlier structural work and also demonstrate the coexistence of the ps and cp phases [18][19][20]. Scanning tunneling microscopy has also been combined with measurements of changes in surface stress in order to investigate the relationship between the structure of the first layer and stress at the interface [17,18].…”

Section: Introductionsupporting

confidence: 64%

“…Although the ps phase is believed to be thermodynamically stable up to a full ML [7,14], limited diffusion at RT induces a transition to the 8×1 commensurate phase at a lower coverage. Depending upon the amount of residual gas contamination and/or the density of steps [7], this transition begins somewhere between ∼0.25 and ∼0.9 ps ML [1,10,[18][19][20]40]. The density of the 8×1 phase is not universally agreed upon [20]: some researchers favor a density of 1.59 × 10 15 atoms cm 2 (which occurs if there are 9 Ni-atom spacings per 8 W-atom spacings along the [001] direction) [18,19], while others favor a more closely packed density of 1.77 × 10 15 atoms cm 2 , (which occurs if there are 10 Ni-atom spacings per 8 W-atom spacings) [1].…”

Section: Assignments Of Spectral Components and Determination Of Ni Cmentioning

confidence: 99%

“…Depending upon the amount of residual gas contamination and/or the density of steps [7], this transition begins somewhere between ∼0.25 and ∼0.9 ps ML [1,10,[18][19][20]40]. The density of the 8×1 phase is not universally agreed upon [20]: some researchers favor a density of 1.59 × 10 15 atoms cm 2 (which occurs if there are 9 Ni-atom spacings per 8 W-atom spacings along the [001] direction) [18,19], while others favor a more closely packed density of 1.77 × 10 15 atoms cm 2 , (which occurs if there are 10 Ni-atom spacings per 8 W-atom spacings) [1]. With increasing Ni coverage the 8×1 phase transforms into the 7×1 cp phase at a coverage between ∼0.5 and ∼1.28 ps ML [18][19][20][21].…”

Section: Assignments Of Spectral Components and Determination Of Ni Cmentioning

confidence: 99%

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Core-level spectroscopy of the Ni/W(110) interface: Correlation of W interfacial core-level shifts with first-layer Ni phases

et al. 2008

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We have measured W 4f 7/2 core-level photoemission spectra from W(110) in the presence of Ni overlayers, from ∼0.2 to ∼3 monolayers. Interfacial core-level shifts associated with first-layer Ni phases have been identified: −230 ± 15 meV for the 1×1 pseudomorphic phase and −70 ± 7 meV for the 7×1 close-packed commensurate phase. At higher Ni coverages the interfacial core-level shift is −100 ± 10 meV. These shifts are analyzed using the partial-shift model of Nilsson et al. [Phys. Rev. B 38 (1988) 10357]; the analysis indicates that the difference in binding energies between the 1×1 and 7×1 phases has a large contribution from structural differences between the two phases.

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Section: Introductionsupporting

confidence: 64%

Section: Assignments Of Spectral Components and Determination Of Ni Cmentioning

confidence: 99%

Section: Assignments Of Spectral Components and Determination Of Ni Cmentioning

confidence: 99%

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Core-level spectroscopy of the Ni/W(110) interface: Correlation of W interfacial core-level shifts with first-layer Ni phases

et al. 2008

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“…A model for the origin of anisotropic chirality. Prior work on a similar system, Fe/8 monolayer Ni/W(110), established that inplane anisotropic strain due to lattice mismatch 31 gives rise to an in-plane uniaxial magnetic anisotropy K u with easy axis along W[001], through magneto-elastic contributions to the magnetic anisotropy 25 . We also confirmed the presence of uniaxial anisotropy K u by SPLEEM observations on thicker in-plane magnetized Fe/Ni films, where the orientation of magnetization of the in-plane domains is always parallel or antiparallel to the W[001] direction.…”

Section: Resultsmentioning

confidence: 99%

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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“…For Fe the growth of subsequent layers depends highly on the temperature 11,12 . The growth of Ni on W(110) at room temperature has been studied with the STM by Sander, Schmidthals et al [13][14][15] . Here we present STM data of Ni grown at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

Scanning tunneling spectroscopy of Ni/W(110): bcc and fcc properties in the second atomic layer

Schöneberg

Berndt

2013

Appl. Phys. A

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Nickel islands are grown on W(110) at elevated temperatures. Islands with a thickness of two layers are investigated with scanning tunneling microscopy. Spectroscopic measurements reveal that nanometer sized areas of the islands exhibit distinctly different apparent heights and dI/dV spectra. Spin polarized and paramagnetic band structure calculations indicate that the spectral features are due to fcc(111) and bcc(110) orientations of the Ni film, respectively.

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Stress and structure of Ni monolayers on W(110): The importance of lattice mismatch

Cited by 68 publications

References 27 publications

Core-level spectroscopy of the Ni/W(110) interface: Correlation of W interfacial core-level shifts with first-layer Ni phases

Core-level spectroscopy of the Ni/W(110) interface: Correlation of W interfacial core-level shifts with first-layer Ni phases

Unlocking Bloch-type chirality in ultrathin magnets through uniaxial strain

Scanning tunneling spectroscopy of Ni/W(110): bcc and fcc properties in the second atomic layer

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