Composite Fe3O4–W(100) probes for scanning tunneling microscopy

Bozhko, S. I.; Chekmazov, Sergey V.; Усов, В.; Lübben, Olaf; Ионов, А.М.; Wu, Han‐Chun; Семенов, В. Н.; Nesterova, Maria Е.; Krasnikov, Sergey A.; Shvets, I. V.

doi:10.1063/1.5001057

Cited by 3 publications

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“…and Fe(B)) with the magnetic moments ferrimagnetically aligned. It is known from density functional theory calculations [50] and spin resolved photoelectron spectroscopy [51] [27]. Individual surface atoms (indicated by green circles in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Using this approach, the probe's functional parameters such as conductivity, band gap, magnetic moment or easy axis can be customized for the investigation of particular samples or to meet specific experimental requirements. In this regard, magnetite is a promising conductive oxide for spin-dependent STM due to its sensitivity to the surface magnetic moment and local density of states (LDOS) [24][25][26][27]. Bulk magnetite undergoes the Verwey transition at Tv ≈ 120 K from a high temperature "bad metal" conducting phase to a low-temperature insulating phase.…”

Section: Introductionmentioning

confidence: 99%

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Deformation and fracture of crystalline tungsten and fabrication of composite STM probes

et al. 2020

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Fracturing microscale constrictions in metallic wires, such as tungsten, platinum, or platinum-iridium, is a common fabrication method used to produce atomically sharp tips for scanning tunneling microscopy (STM), field-emission microscopy and field ion microscopy. Typically, a commercial polycrystalline drawn wire is locally thinned and then fractured by means of a dislocation slip inside the constriction. We examine a special case where a dislocation-free microscale constriction is created and fractured in a single crystal tungsten rod with a long side parallel to the [100] direction. In the absence of dislocations, vacancies become the main defects in the constriction which breaks under the tensile stress of approximately 10 GPa, which is close to the theoretical fracture strength for an ideal monocrystalline tungsten. We propose that the vacancies are removed early in the tensile test by means of deformation annealing, creating a defect-free tungsten constriction which cleaves along the W(100) plane. This approach enables fabrication of new composite STM probes which demonstrate excellent stability, atomic resolution and magnetic contrast that cannot be attained using conventional methods.

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Section: Resultsmentioning

confidence: 99%