Bulk Cr tips with full spatial magnetic sensitivity for spin-polarized scanning tunneling microscopy

Schlenhoff, Anika; Krause, Stefan; Herzog, G.; Wiesendanger, R.

doi:10.1063/1.3474659

Cited by 63 publications

(43 citation statements)

References 17 publications

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“…Besides the obvious choice of ferromagnetic materials for the fabrication of the tips [37][38][39] , antiferromagnetic materials can be used [40][41][42] . Antiferromagnetic materials have the advantage that they only exhibit weak stray fields, and an influence of the tip on the investigated magnetic structures can therefore be excluded, making them more suitable for small and magnetically susceptible structures.…”

Section: B Magnetic Tip Preparationmentioning

confidence: 99%

Quantum interference effects in molecular spin hybrids

et al. 2017

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We have studied by means of low-temperature scanning tunneling microscopy (STM) and spectroscopy (STS) single molecular spin hybrids formed upon chemisorbing a polycyclic aromatic, 3-fold symmetric hydrocarbon molecule on Co(111) nanoislands. The spin-dependent hybridization between the Co d-states and the π-orbitals of the molecule leads to a spin-imbalanced electronic structure of the chemisorbed organic molecule. Spin-sensitive measurements reveal that the spin polarization shows intramolecular variations among the different aromatic rings in spite of the highly symmetric adsorption geometry promoted by symmetry matching of the 3-fold symmetric molecule and the 6-fold symmetric Co(111) lattice. Hence, the varying degree of spin polarization on the organic molecule does not stem from a different hybridization of the aromatic rings with the Co atoms, but is proposed to be a consequence of the superposition of the spin polarization of the molecule and the spatially modulated spin polarization of the spin-dependent quantum interference pattern of the Co(111) surface state.

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Section: B Magnetic Tip Preparationmentioning

confidence: 99%

Quantum interference effects in molecular spin hybrids

et al. 2017

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“…8,9 Schlenhoff et al 8 presented SP-STS measures on a 1.5 ML Fe film on W(110). The interpretation of their experimental data is however complicated by a bias-dependent tip-sample distance, 43,45 following the dI/dV acquisition, obtained in a constant current mode.…”

Section: Spin Sensitivity Of Bulk Cr Tipsmentioning

confidence: 99%

“…Proposed since the invention of the SP-STM technique, 6 bulk Cr tips have been demonstrated to provide spin contrast in SP-STM 7 and SP-STS experiments 8,9 only in recent years. Such works pointed out the sensitivity of these probes, but the magnetic behavior of bulk Cr tips, i.e., the sign and the energy dependence of spin polarization, as well as the tip magnetic easy axis and response to magnetic field, seems to differ among the various experiments.…”

Section: Introductionmentioning

confidence: 99%

Electronic and magnetic properties of bulk Cr tips for scanning tunneling spectroscopy

et al. 2013

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The electronic and magnetic properties of bulk Cr tips for scanning tunneling microscopy have been investigated by means of density functional theory (DFT) calculations and scanning tunneling spectroscopy (STS) measurements. Spin-resolved densities of states (DOS) were calculated for model tips, i.e., Cr adatoms and clusters on ideal Cr surfaces. STS measurements on Au(111) and Si(111)-7×7 have been interpreted by modeling the tunneling process in a Wentzel-Kramers-Brillouin approximation in order to ascertain the role of tip DOS features. Calculated spin-resolved electronic properties of Cr tips have been used to revisit spin-polarized (SP) STS measurements from the literature. The agreement between experimental findings and DFT calculations confirms the relevance of the knowledge of tip electronic properties and of an appropriate model for the tunneling process in the interpretation of STS and SP-STS data.

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“…1(a): A magnetic probe tip with a well-defined spin orientation at the front atom is used in order to be sensitive to the spinpolarized contribution to the tunnel current, which depends on the projection of the local sample magnetization onto the quantization axis provided by the magnetization direction of the tip. Here, we use an antiferromagnetic bulk Cr tip to avoid magnetic interactions of the tip with the sample or an applied field [20,21].…”

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confidence: 99%

An Inside View of Magnetic Skyrmions

Marrows

2015

Physics

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The atomic-scale spin structure of individual isolated Skyrmions in an ultrathin film is investigated in real space by spin-polarized scanning tunneling microscopy. Their axial symmetry as well as their unique rotational sense is revealed by using both out-of-plane and in-plane sensitive tips. The size and shape of Skyrmions change as a function of the magnetic field. An analytical expression for the description of Skyrmions is proposed and applied to connect the experimental data to the original theoretical model describing chiral Skyrmions. Thereby, the relevant material parameters responsible for Skyrmion formation can be obtained.

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Bulk Cr tips with full spatial magnetic sensitivity for spin-polarized scanning tunneling microscopy

Cited by 63 publications

References 17 publications

Quantum interference effects in molecular spin hybrids

Quantum interference effects in molecular spin hybrids

Electronic and magnetic properties of bulk Cr tips for scanning tunneling spectroscopy

An Inside View of Magnetic Skyrmions

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