Barnett effect in paramagnetic states

Masao Ono; Hiroyuki Chudo; Kazuya Harii; Satoru Okayasu; Mamoru Matsuo; Jun'Ichi Ieda; Ryo Takahashi; Sadamichi Maekawa; Eiji Saitoh

doi:10.1103/PhysRevB.92.174424

Barnett effect in paramagnetic states

Masao Ono, Hiroyuki Chudo, Kazuya Harii, Satoru Okayasu, Mamoru Matsuo, Jun'Ichi Ieda, Ryo Takahashi, Sadamichi Maekawa, Eiji Saitoh

Advanced Institute for Materials Research (AIMR)

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

25 Citations (Scopus)

Abstract

We report the observation of the Barnett effect in paramagnetic states by mechanically rotating gadolinium (Gd) metal with a rotational frequency of up to 1.5 kHz above the Curie temperature. An in situ magnetic measurement setup comprising a high-speed rotational system and a fluxgate magnetic sensor was developed for the measurement. Temperature dependence of the observed magnetization follows that of paramagnetic susceptibility, indicating that any emergent magnetic field is proportional to the rotational frequency and is independent of temperature. From the proportionality constant of the emergent field, the gyromagnetic ratio of Gd is calculated to be -29±5GHz/T. This study revisits the primordial issue of magnetism with modern technologies to shed new light on the fundamental spin-rotation coupling.

Original language	English
Article number	174424
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	92
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.92.174424
Publication status	Published - 2015 Nov 30

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.92.174424

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abstract = "We report the observation of the Barnett effect in paramagnetic states by mechanically rotating gadolinium (Gd) metal with a rotational frequency of up to 1.5 kHz above the Curie temperature. An in situ magnetic measurement setup comprising a high-speed rotational system and a fluxgate magnetic sensor was developed for the measurement. Temperature dependence of the observed magnetization follows that of paramagnetic susceptibility, indicating that any emergent magnetic field is proportional to the rotational frequency and is independent of temperature. From the proportionality constant of the emergent field, the gyromagnetic ratio of Gd is calculated to be -29±5GHz/T. This study revisits the primordial issue of magnetism with modern technologies to shed new light on the fundamental spin-rotation coupling.",

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T1 - Barnett effect in paramagnetic states

AU - Ono, Masao

AU - Chudo, Hiroyuki

AU - Harii, Kazuya

AU - Okayasu, Satoru

AU - Matsuo, Mamoru

AU - Ieda, Jun'Ichi

AU - Takahashi, Ryo

AU - Maekawa, Sadamichi

AU - Saitoh, Eiji

PY - 2015/11/30

Y1 - 2015/11/30

N2 - We report the observation of the Barnett effect in paramagnetic states by mechanically rotating gadolinium (Gd) metal with a rotational frequency of up to 1.5 kHz above the Curie temperature. An in situ magnetic measurement setup comprising a high-speed rotational system and a fluxgate magnetic sensor was developed for the measurement. Temperature dependence of the observed magnetization follows that of paramagnetic susceptibility, indicating that any emergent magnetic field is proportional to the rotational frequency and is independent of temperature. From the proportionality constant of the emergent field, the gyromagnetic ratio of Gd is calculated to be -29±5GHz/T. This study revisits the primordial issue of magnetism with modern technologies to shed new light on the fundamental spin-rotation coupling.

AB - We report the observation of the Barnett effect in paramagnetic states by mechanically rotating gadolinium (Gd) metal with a rotational frequency of up to 1.5 kHz above the Curie temperature. An in situ magnetic measurement setup comprising a high-speed rotational system and a fluxgate magnetic sensor was developed for the measurement. Temperature dependence of the observed magnetization follows that of paramagnetic susceptibility, indicating that any emergent magnetic field is proportional to the rotational frequency and is independent of temperature. From the proportionality constant of the emergent field, the gyromagnetic ratio of Gd is calculated to be -29±5GHz/T. This study revisits the primordial issue of magnetism with modern technologies to shed new light on the fundamental spin-rotation coupling.

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Barnett effect in paramagnetic states

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