Superparamagnetic response of Fe-coated W tips in spin-polarized scanning tunneling microscopy

Phark, Soo-hyon; Fischer, Jeison A.; Corbetta, Marco; Sander, Dirk; Kirschner, J.

doi:10.1063/1.4815993

Cited by 10 publications

(14 citation statements)

References 26 publications

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“…It is evident that the tip and its detailed apex configuration are central for performing reliable spin-resolved spectroscopy measurements (Phark et al, 2013). Recent experiments by combined atomic force microscopy and STM offer a venue to characterize tips and their apex configurations on the atomic scale, and corresponding experiments would improve the tip characterization considerably (Welker and Giessibl, 2012).…”

Section: Characterization and Control Of Magnetic Sp-stm Tipsmentioning

confidence: 99%

Spin-polarized quantum confinement in nanostructures: Scanning tunneling microscopy

et al. 2014

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Experimental investigations of spin-polarized electron confinement in nanostructures by scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) are reviewed. To appreciate the experimental results on the electronic level, the physical basis of STM is elucidated with special emphasis on the correlation between differential conductance, as measured by STS, and the electron density of states, which is accessible in ab initio theory. Experimental procedures which allow one to extract the electron dispersion relation from energy-dependent and spatially resolved STM and STS studies of electron confinement are reviewed. The role of spin polarization in electron confinement is highlighted by both experimental and theoretical insights, which indicate variation of the spin polarization in sign and magnitude on the nanometer scale. This review provides compelling evidence for the necessity to include spatial-dependent spin-resolved electronic properties for an in-depth understanding and quantitative assessment of electron confinement in magnetic nanostructures and interaction between magnetic adatoms.

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Section: Characterization and Control Of Magnetic Sp-stm Tipsmentioning

confidence: 99%

Spin-polarized quantum confinement in nanostructures: Scanning tunneling microscopy

et al. 2014

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“…Our empirical observations tell us that the tip behavior is not conclusively determined by the macroscopic tip preparation. Rather, the tip response to the field is largely determined by microscopic changes at the tip apex [46,48].…”

Section: The Extraction Of Switching Fields and Spin Polarization Fromentioning

confidence: 99%

The impact of structural relaxation on spin polarization and magnetization reversal of individual nano structures studied by spin-polarized scanning tunneling microscopy

Sander

Phark

Corbetta

et al. 2014

J. Phys.: Condens. Matter

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The application of low temperature spin-polarized scanning tunneling microscopy and spectroscopy in magnetic fields for the quantitative characterization of spin polarization, magnetization reversal and magnetic anisotropy of individual nano structures is reviewed. We find that structural relaxation, spin polarization and magnetic anisotropy vary on the nm scale near the border of a bilayer Co island on Cu(1 1 1). This relaxation is lifted by perimetric decoration with Fe. We discuss the role of spatial variations of the spin-dependent electronic properties within and at the edge of a single nano structure for its magnetic properties.

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“…The sequential deposition leads to the formation of two different types of islands on the Cu substrate; Fe|Co island and isolated Fe island, both are BL high. STM and STS on an Fe|Co island revealed that the distinction between Co and two different Fe structural phases is possible by a difference in apparent heights and pronounced spectroscopic signatures in the differential conductance 26 . In order to obtain magnetic contrast, we used Cr/Co-coated W tips.…”

Section: Methodsmentioning

confidence: 99%

“…1; Supplementary Note 2), which indicates that the island does not present a measurable periodic magnetic order at 0 T 25 . Figure 2a,b shows the differential conductance images of pure Fe islands and a Co island in circumferential contact with an Fe BL rim (Fe|Co island) 26 (see also Methods section), respectively, where Co, Fe-a and Fe-b are identified by STS measurements (Supplementary Fig. 1; Supplementary Note 1).…”

Section: Spin-dependent Differential Conductance Of Fe Nanoislandsmentioning

confidence: 99%

Reduced-dimensionality-induced helimagnetism in iron nanoislands

et al. 2014

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Low-dimensionality in magnetic materials often leads to noncollinear magnetic order, such as a helical spin order and skyrmions, which have received much attention because of envisioned applications in spin transport and in future data storage. Up to now, however, the real-space observation of the noncollinear magnetic order has been limited mostly to systems involving a strong spin-orbit interaction. Here we report a noncollinear magnetic order in individual nanostructures of a prototypical magnetic material, bilayer iron islands on Cu (111). Spin-polarized scanning tunnelling microscopy reveals a magnetic stripe phase with a period of 1.28 nm, which is identified as a one-dimensional helical spin order. Ab initio calculations identify reduced-dimensionality-enhanced long-range antiferromagnetic interactions as the driving force of this spin order. Our findings point at the potential of nanostructured magnets as a new experimental arena of noncollinear magnetic order stabilized in a nanostructure, magnetically decoupled from the substrate.

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Superparamagnetic response of Fe-coated W tips in spin-polarized scanning tunneling microscopy

Cited by 10 publications

References 26 publications

Spin-polarized quantum confinement in nanostructures: Scanning tunneling microscopy

Spin-polarized quantum confinement in nanostructures: Scanning tunneling microscopy

The impact of structural relaxation on spin polarization and magnetization reversal of individual nano structures studied by spin-polarized scanning tunneling microscopy

Reduced-dimensionality-induced helimagnetism in iron nanoislands

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