@misc{9243089,
  abstract     = {{Magnetic material-superconductor heterostructures are promising candidates for applications in superconducting electronics and superconducting spintronics. This thesis investigates bar devices of two different magnetic material-superconductor heterostructures: CuMnAs/Al and MnTe/Al, where CuMnAs is an antiferromagnet (AFM) and MnTe is an altermagnet. AFMs and altermagnets are interesting for use in spintronics due to their net zero magnetization resulting in no stray fields. During measurements the MnTe/Al heterostructure showed directional dependence of the sheet resistance, and logarithmically increasing resistance with decreasing temperature. No superconductivity was observed, which is speculated to be from magnetic moments in MnTe suppressing superconductivity. The temperature dependence of the resistance could be due to weak localization or the Kondo effect. The CuMnAs/Al sample showed strong hysteresis with regards to field history. An out of plane field was used to non-monotonically shift the peak switching current as a function of in plane field, and a W-shaped switching current as a function of in-plane field was found for both studied devices depending on the field history. Furthermore, a large zero-field superconducting diode effect (SDE) (η≥18 %) for both studied devices was found, with a maximum of η = 22.7 %. This result makes the CuMnAs/Al heterostructure a promising candidate as a zero-field superconducting diode without stray field. The origin of the zero-field SDE as well as of the out of plane field history effects on the switching current behavior is speculated to be due to uncompensated magnetic moments near the CuMnAs/Al interface. The W- shaped switching current as a function of magnetic field might be explained by spin canting.}},
  author       = {{Edwinson, Tobias}},
  language     = {{eng}},
  note         = {{Student Paper}},
  title        = {{CuMnAs/Al and MnTe/Al Magnetic Material-Superconductor Heterostructures}},
  year         = {{2026}},
}