Romanisches Café

Mueller, Dennis C.; Koeppen, Wolfgang

doi:10.2307/40127644

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Ho Single Atom Switching and Sources Of Error1

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2018

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“…The main sources for error in our analysis stem from the small number of switching events at low bias voltages, and from the about 10 pm peak-to-peak z-noise level, which is more critical at higher switching rates due to the required averaging times of 20 to 100 ms in view of the oftentimes only 2 pm tip-height contrast. We accounted for missed events via R true = R meas /(1 + R meas * τ ), where τ is the effective dead-time (maximum of preamplifier bandwidth and averaging time), and R meas is the measured switching rate [19].…”

Section: Ho Single Atom Switching and Sources Of Errormentioning

confidence: 99%

Thermal and Magnetic-Field Stability of Holmium Single-Atom Magnets

et al. 2018

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We use spin-polarized scanning tunneling microscopy to demonstrate that Ho atoms on magnesium oxide exhibit a coercive field of more than 8 T and magnetic bistability for many minutes, both at 35 K. The first spontaneous magnetization reversal events are recorded at 45 K, for which the metastable state relaxes in an external field of 8 T. The transverse magnetic anisotropy energy is estimated from magnetic field and bias voltage dependent switching rates at 4.3 K. Our measurements constrain the possible ground state of Ho single-atom magnets to either J_{z}=7 or 8, both compatible with magnetic bistability at fields larger than 10 mT.

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Section: Ho Single Atom Switching and Sources Of Errormentioning

confidence: 99%