Joseph A. Glick

Critical current oscillations of elliptical Josephson junctions with single-domain ferromagnetic layers

Josephson junctions containing ferromagnetic layers are of considerable interest for the development of practical cryogenic memory and superconducting qubits. Such junctions exhibit a ground-state phase shift of π for certain ranges of ferromagnetic layer thicknesses. We present studies of Nb based micron-scale elliptically shaped Josephson junctions containing ferromagnetic barriers of Ni81Fe19 or Ni65Fe15Co20. By applying an external magnetic field, the critical current of the junctions is found to follow characteristic Fraunhofer patterns and display sharp switching behavior suggestive of single-domain magnets. The high quality of the Fraunhofer patterns enables us to extract the maximum value of the critical current even when the peak is shifted significantly outside the range of the data due to the magnetic moment of the ferromagnetic layer. The maximum value of the critical current oscillates as a function of the ferromagnetic barrier thickness, indicating transitions in the phase difference across ...

Spin-triplet supercurrent in Josephson junctions containing a synthetic antiferromagnet with perpendicular magnetic anisotropy

We present measurements of Josephson junctions containing three magnetic layers with noncolinear magnetizations. The junctions are of the form

Critical Current Oscillations of Josephson Junctions Containing PdFe Nanomagnets

S/F^{\prime}/N/F/N/F^{\prime \prime}/S

Phase control in a spin-triplet SQUID

, where

Controllable 0-[pi] Josephson junctions containing a ferromagnetic spin valve

S

Spin-valve Josephson junctions for cryogenic memory

is superconducting Nb,

Phase-controllable spin-triplet Josephson junctions containing a synthetic antiferromagnet

F^\prime

Controllable 0 – π Switching in Ferromagnetic Josephson Junctions for Cryogenic Memory

is either a thin Ni or Permalloy layer with in-plane magnetization,

Ferromagnetic Josephson junctions incorporating both in and out-of-plane magnetic anisotropy.

N

Josephson Junctions Carrying Spin-Triplet Supercurrent for Cryogenic Memory

is the normal metal Cu,