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Ultralow mechanical damping with Meissner-levitated ferromagnetic microparticles

Ultralow mechanical damping with Meissner-levitated ferromagnetic microparticles
Ultralow mechanical damping with Meissner-levitated ferromagnetic microparticles
Levitated nanoparticles and microparticles are excellent candidates for the realization of extremely isolated mechanical systems, with a huge potential impact in sensing applications and in quantum physics. Magnetic levitation based on static fields is a particularly interesting approach, due to the unique property of being completely passive and compatible with low temperatures. Here, we show experimentally that micromagnets levitated above type-I superconductors feature very low damping at low frequency and low temperature. In our experiment, we detect 5 out of 6 rigid-body mechanical modes of a levitated ferromagnetic microsphere, using a dc SQUID (Superconducting Quantum Interference Device) with a single pick-up coil. The measured frequencies are in agreement with a finite element simulation based on ideal Meissner effect. For two specific modes we find further substantial agreement with analytical predictions based on the image method. We measure damping times τ exceeding 104 s and quality factors Q beyond 107, improving by 2−3 orders of magnitude over previous experiments based on the same principle. We investigate the possible residual loss mechanisms besides gas collisions, and argue that much longer damping time can be achieved with further effort and optimization. Our results open the way towards the development of ultrasensitive magnetomechanical sensors with potential applications to magnetometry and gravimetry, as well as to fundamental and quantum physics.
2331-7019
Vinante, Andrea
f023d600-0537-41c4-b307-bf9cdfc1f56c
Falferi, Paolo
f4414eea-801d-4d86-a07d-6569263b14a1
Gasbarri, Giulio
1f6df418-5a22-4ec4-b24e-68aa10e0a684
Setter, Ashley James
00a0c476-7b25-41a7-9cda-b55d14cccf05
Timberlake, Christopher
0389857f-3bb0-4e90-96f0-363591417d50
Ulbricht, Hendrik
5060dd43-2dc1-47f8-9339-c1a26719527d
Vinante, Andrea
f023d600-0537-41c4-b307-bf9cdfc1f56c
Falferi, Paolo
f4414eea-801d-4d86-a07d-6569263b14a1
Gasbarri, Giulio
1f6df418-5a22-4ec4-b24e-68aa10e0a684
Setter, Ashley James
00a0c476-7b25-41a7-9cda-b55d14cccf05
Timberlake, Christopher
0389857f-3bb0-4e90-96f0-363591417d50
Ulbricht, Hendrik
5060dd43-2dc1-47f8-9339-c1a26719527d

Vinante, Andrea, Falferi, Paolo, Gasbarri, Giulio, Setter, Ashley James, Timberlake, Christopher and Ulbricht, Hendrik (2020) Ultralow mechanical damping with Meissner-levitated ferromagnetic microparticles. Physical Review Applied, 13 (064027). (doi:10.1103/PhysRevApplied.13.064027).

Record type: Article

Abstract

Levitated nanoparticles and microparticles are excellent candidates for the realization of extremely isolated mechanical systems, with a huge potential impact in sensing applications and in quantum physics. Magnetic levitation based on static fields is a particularly interesting approach, due to the unique property of being completely passive and compatible with low temperatures. Here, we show experimentally that micromagnets levitated above type-I superconductors feature very low damping at low frequency and low temperature. In our experiment, we detect 5 out of 6 rigid-body mechanical modes of a levitated ferromagnetic microsphere, using a dc SQUID (Superconducting Quantum Interference Device) with a single pick-up coil. The measured frequencies are in agreement with a finite element simulation based on ideal Meissner effect. For two specific modes we find further substantial agreement with analytical predictions based on the image method. We measure damping times τ exceeding 104 s and quality factors Q beyond 107, improving by 2−3 orders of magnitude over previous experiments based on the same principle. We investigate the possible residual loss mechanisms besides gas collisions, and argue that much longer damping time can be achieved with further effort and optimization. Our results open the way towards the development of ultrasensitive magnetomechanical sensors with potential applications to magnetometry and gravimetry, as well as to fundamental and quantum physics.

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micromagneticlevitation_v7 - Accepted Manuscript
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More information

Accepted/In Press date: 15 May 2020
e-pub ahead of print date: 11 June 2020
Published date: June 2020

Identifiers

Local EPrints ID: 441279
URI: http://eprints.soton.ac.uk/id/eprint/441279
ISSN: 2331-7019
PURE UUID: ffe881eb-5473-4e5d-80d9-1340f575d211
ORCID for Andrea Vinante: ORCID iD orcid.org/0000-0002-9385-2127
ORCID for Ashley James Setter: ORCID iD orcid.org/0000-0003-3723-3468

Catalogue record

Date deposited: 08 Jun 2020 16:31
Last modified: 12 Oct 2020 16:34

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