NMR investigation of the magnetic susceptibility anisotropy in3He-A

Richard Haley; Allen Armstrong; Fergus Clancy; Antti Manninen; John Hook; Henry Hall

doi:10.1007/BF00753391

NMR investigation of the magnetic susceptibility anisotropy in³He-A

Richard Haley^*, Allen Armstrong, Fergus Clancy, Antti Manninen, John Hook, Henry Hall

^*Corresponding author for this work

Not published at VTT

Research output: Contribution to journal › Article › Scientific › peer-review

1 Citation (Scopus)

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 μm 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.

Original language	English
Pages (from-to)	787-792
Number of pages	6
Journal	Journal of Low Temperature Physics
Volume	101
Issue number	3-4
DOIs	https://doi.org/10.1007/BF00753391
Publication status	Published - 1 Nov 1995
MoE publication type	A1 Journal article-refereed

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title = "NMR investigation of the magnetic susceptibility anisotropy in3He-A",

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 μm 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.",

author = "Richard Haley and Allen Armstrong and Fergus Clancy and Antti Manninen and John Hook and Henry Hall",

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T1 - NMR investigation of the magnetic susceptibility anisotropy in3He-A

AU - Haley, Richard

AU - Armstrong, Allen

AU - Clancy, Fergus

AU - Manninen, Antti

AU - Hook, John

AU - Hall, Henry

PY - 1995/11/1

Y1 - 1995/11/1

N2 - 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 μm 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.

AB - 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 μm 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.

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VL - 101

SP - 787

EP - 792

JO - Journal of Low Temperature Physics

JF - Journal of Low Temperature Physics

IS - 3-4

ER -

NMR investigation of the magnetic susceptibility anisotropy in³He-A

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