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Title: Magnetic properties of low-moment ferrimagnetic Heusler Cr 2CoGa thin films grown by molecular beam epitaxy

Recently, theorists have predicted many materials with a low magnetic moment and large spin-polarization for spintronic applications. These compounds are predicted to form in the inverse Heusler structure; however, many of these compounds have been found to phase segregate. In this study, ordered Cr 2CoGa thin films were synthesized without phase segregation using molecular beam epitaxy. The present as-grown films exhibit a low magnetic moment from antiferromagnetically coupled Cr and Co atoms as measured with superconducting quantum interface device magnetometry and soft X-ray magnetic circular dichroism. Electrical measurements demonstrated a thermally-activated semiconductor-like resistivity component with an activation energy of 87 meV. Finally, these results confirm spin gapless semiconducting behavior, which makes these thin films well positioned for future devices.
ORCiD logo [1] ;  [2] ;  [3] ; ORCiD logo [3] ;  [3] ;  [3]
  1. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research; Northeastern Univ., Boston, MA (United States). Dept. of Physics
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  3. Northeastern Univ., Boston, MA (United States). Dept. of Physics
Publication Date:
OSTI Identifier:
Grant/Contract Number:
AC02-06CH11357; AC02-98CH10886; ECCS-1402738
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 109; Journal Issue: 18; Journal ID: ISSN 0003-6951
American Institute of Physics (AIP)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Country of Publication:
United States
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Magnetic moments; Magnetic films; X-ray diffraction; Phase segregation; Magnetic annealing