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NMR investigation of the magnetic-susceptibility anisotropy in HE-3-A.

Research output: Contribution to journalJournal article

Published

  • Richard Haley
  • Allen Armstrong
  • Fergus Clancy
  • Antti Manninen
  • John Hook
  • Henry Hall
<mark>Journal publication date</mark>11/1995
<mark>Journal</mark>Journal of Low Temperature Physics
Issue3-4
Volume101
Number of pages6
Pages787-792
<mark>Original language</mark>English

Abstract

We have investigated transverse continuous wave NMR in a geometry where the modes are influenced by susceptibility anisotropy. The helium sample is separated by mylar foils into layers 12 mu m thick perpendicular to the external dc magnetic field. In this geometry l is constrained to be parallel to the field and d switches from parallel to perpendicular to the field over a small range of field around the dipole unlocking field. The mode frequencies below this critical field yield a value for the susceptibility anisotropy. Above the critical field the expected negative frequency shift is observed, as well as a positive frequency shift due to bulk material and an unexpected signal close to the Larmor frequency.