Spin-Dependent Quantum Interference Within a Single Magnetic Nanostructure

Oka, Hideki; Ignatiev, P. A.; Wedekind, Sebastian; Rodary, Guillemin; Niebergall, L.; Stepanyuk, V. S.; Sander, Dirk; Kirschner, J.

doi:10.1126/science.1183224

Cited by 106 publications

(132 citation statements)

References 24 publications

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“…To name a few, SP-STM has been employed to probe the magnetization of nanoscale cobalt islands, 2 to measure the magnetic hysteresis in FM nanostructures, 3,4 and to study spin-dependent quasi-particle interference. 5 Recently, SP-STM has also been applied to study strongly correlated electron materials, 6,7 providing further insights into the exotic phases found in these materials. 8 SP-STM operating with a vector magnet has been extensively used to map the local surface spin textures in different systems, including the chiral magnetic order that develops in a Mn monolayer formed on W(110), 9 , the "stripe-like" antiferromagnetic (AFM) order present in iron-based superconducting materials, 7 , and the Neél-type AFM order in FeSe thin-film grown on the SrTiO 3 (111) surface.…”

Section: Introductionmentioning

confidence: 99%

Cryogenic STM in 3D vector magnetic fields realized through a rotatable insert

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Yim

McLaren

et al. 2017

Review of Scientific Instruments

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Spin-polarized scanning tunneling microscopy (SP-STM) performed in vector magnetic fields promises atomic scale imaging of magnetic structure, providing complete information on the local spin texture of a sample in three dimensions. Here, we have designed and constructed a turntable system for a low temperature STM which in combination with a 2D vector magnet provides magnetic fields of up to 5 T in any direction relative to the tip-sample geometry. This enables STM imaging and spectroscopy to be performed at the same atomic-scale location and field-of-view on the sample, and most importantly, without experiencing any change on the tip apex before and after field switching. Combined with a ferromagnetic tip this enables us to study the magnetization of complex magnetic orders in all three spatial directions.

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Section: Introductionmentioning

confidence: 99%

Cryogenic STM in 3D vector magnetic fields realized through a rotatable insert

Trainer

Yim

McLaren

et al. 2017

Review of Scientific Instruments

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“…We note that also definitions leading to the opposite sign of A are used. 9,46 In the framework of the WKB model already used to interpret our spin-integrated results, it is possible to show that at zero bias A is the product of the sample and the tip spin polarizations at the Fermi level, A(0) = P s (0)P t (0), 25 allowing for the determination of P t (0) when the other quantities are known. At finite bias, the relation between A, P s , and P t is in general not available, but one can approximate it as A(V ) ≈ P s (eV )P t (0) or A(V ) ≈ P t (−eV )P s (0) by neglecting the tip or sample dependence on energy of the DOS and spin polarization.…”

Section: Spin Sensitivity Of Bulk Cr Tipsmentioning

confidence: 94%

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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“…STM was also applied to study the interactions between isolated Mn acceptors and the influence of the surface on the impurity properties in diluted magnetic semiconductors, e.g., Mn-doped GaAs. 8,9 More interesting, spin-polarized STM, sensitive to surface magnetization, 10 has been used to map the morphology and the density of states of single magnetic structures 11 and magnetic quantum dots. 12 STM has also been employed in the investigation and identification of promising molecular switches, which could be used in future nanoscale circuits.…”

Section: Introductionmentioning

confidence: 99%

Scanning tunneling microscope operating as a spin diode

et al. 2011

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We theoretically investigate spin-polarized transport in a system composed of a ferromagnetic scanningtunneling-microscope (STM) tip coupled to an adsorbed atom (adatom) on a host surface. Electrons can tunnel directly from the tip to the surface or via the adatom. Since the tip is ferromagnetic and the host surface (metal or semiconductor) is nonmagnetic we obtain a spin-diode effect when the adatom is in the regime of single occupancy. This effect leads to an unpolarized current for direct bias (V > 0) and polarized current for reverse (V < 0) bias voltages, if the tip is nearby the adatom. Within the nonequilibrium Keldysh technique we analyze the interplay between the lateral displacement of the tip and the intra adatom Coulomb interaction on the spin-diode effect. As the tip moves away from the adatom the spin-diode effect vanishes and the currents become polarized for both V > 0 and V < 0. We also find an imbalance between the up and down spin populations in the adatom, which can be tuned by the tip position and the bias. Finally, due to the presence of the adsorbate on the surface, we observe spin-resolved Friedel oscillations in the current, which reflects the oscillations in the calculated local density of states (LDOS) of the subsystem surface + adatom.

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Spin-Dependent Quantum Interference Within a Single Magnetic Nanostructure

Cited by 106 publications

References 24 publications

Cryogenic STM in 3D vector magnetic fields realized through a rotatable insert

Cryogenic STM in 3D vector magnetic fields realized through a rotatable insert

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

Scanning tunneling microscope operating as a spin diode

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