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VOLUME 108 | ISSUE 12 | PAGE 827
NMR shifts in 3He in aerogel induced by demagnetizing fields
Abstract
Magnetic materials generate demagnetizing field that depends on geometry of the sample and results in a shift of magnetic resonance frequency. This phenomenon should occur in porous nanostructures as well, e.g., in globally anisotropic aerogels. Here we report results of nuclear magnetic resonance experiments with liquid 3He confined in anisotropic aerogels with different types of anisotropy (nematic and planar aerogels). Strands of aerogels in pure 3He are covered by a few atomic layers of paramagnetic solid 3He which magnetization follows the Curie-Weiss law. We have found that in our samples the nuclear magnetic resonance shift in solid 3He is clearly seen at ultralow temperatures and depends on value and orientation of the magnetic field. The obtained results are well described by a model of a system of non-interacting paramagnetic cylinders. The shift is proportional to the magnetization of solid 3He and may complicate nuclear magnetic resonance experiments with superfluid 3He in aerogel.