
Logan Bishop-Van Horn
Ph.D. Student in Physics, admitted Autumn 2017
Education & Certifications
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M.S., Stanford University, Physics (2019)
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B.A., Clark University, Physics & Mathematics (2016)
All Publications
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SuperScreen: An open-source package for simulating the magnetic response of two-dimensional superconducting devices
COMPUTER PHYSICS COMMUNICATIONS
2022; 280
View details for DOI 10.1016/j.cpc.2022.108464
View details for Web of Science ID 000863271300005
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Local imaging of diamagnetism in proximity-coupled niobium nanoisland arrays on gold thin films
PHYSICAL REVIEW B
2022; 106 (5)
View details for DOI 10.1103/PhysRevB.106.054521
View details for Web of Science ID 000875057900004
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Imaging anisotropic vortex dynamics in FeSe
PHYSICAL REVIEW B
2019; 100 (2)
View details for DOI 10.1103/PhysRevB.100.024514
View details for Web of Science ID 000476686700006
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Cryogen-free variable temperature scanning SQUID microscope.
The Review of scientific instruments
2019; 90 (6): 063705
Abstract
Scanning Superconducting QUantum Interference Device (SQUID) microscopy is a powerful tool for imaging local magnetic properties of materials and devices, but it requires a low-vibration cryogenic environment, traditionally achieved by thermal contact with a bath of liquid helium or the mixing chamber of a "wet" dilution refrigerator. We mount a SQUID microscope on the 3 K plate of a Bluefors cryocooler and characterize its vibration spectrum by measuring SQUID noise in a region of sharp flux gradient. By implementing passive vibration isolation, we reduce relative sensor-sample vibrations to 20 nm in-plane and 15 nm out-of-plane. A variable-temperature sample stage that is thermally isolated from the SQUID sensor enables the measurement at sample temperatures from 2.8 K to 110 K. We demonstrate these advances by imaging inhomogeneous diamagnetic susceptibility and vortex pinning in optimally doped yttrium barium copper oxide above 90 K.
View details for DOI 10.1063/1.5085008
View details for PubMedID 31255038