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Whispering-gallery mode sensor based on coupling of tapered two-mode fiber and glass capillary.
Rev Sci Instrum
January 2025
Hubei Key Laboratory of Optoelectronic Conversion Materials and Devices, Hubei Engineering Research Center for Micronano Optoelectronic Devices and Integration, College of Physics and Electronic Science, Hubei Normal University, Huangshi, Hubei 435002, People's Republic of China.
A novel whispering-gallery mode (WGM) sensor is fabricated by coupling a tapered two-mode fiber and a glass capillary. By utilizing the relatively large orifice of glass capillaries, polydimethylsiloxane (PDMS) and magnetic fluid are directly injected into two WGM structured glass capillaries, respectively, allowing these materials to substantially interact with the light field of the WGM, thereby achieving temperature, pressure, and magnetic field measurements. λ1 and λ2 are the two resonant peak wavelengths of the WGM after injecting PDMS into a glass capillary.
View Article and Find Full Text PDFA Triangular Frustrated Eu(II)-Organic Framework for Sub-Kelvin Magnetic Refrigeration.
J Am Chem Soc
January 2025
Department of Chemistry, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
Attaining sub-Kelvin temperatures remains technologically challenging and often relies on the scarce resource He, unless employing adiabatic demagnetization refrigeration. Herein, the active coolant typically consists of weakly coupled paramagnetic ions, whose magnetic interaction strengths are comparable in energy to the relevant temperature regime of cooling. Such interactions depend strongly on inter-ion distances, fundamentally hindering the realization of dense coolants for sub-Kelvin refrigeration.
View Article and Find Full Text PDFStripe charge order and its interaction with Majorana bound states in 2M-WS topological superconductors.
Natl Sci Rev
February 2025
State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.
To achieve logic operations via Majorana braiding, positional control of the Majorana bound states (MBSs) must be established. Here we report the observation of a striped surface charge order coexisting with superconductivity and its interaction with the MBS in the topological superconductor 2M-WS, using low-temperature scanning tunneling microscopy. By applying an out-of-plane magnetic field, we observe that MBSs are absent in vortices in the region with stripe order.
View Article and Find Full Text PDFEffect of oscillating magnetic field (OMF) on the supercooling behavior of iron-oxide nanoparticle (IONP) agar model system.
J Food Sci
January 2025
Department of Human Nutrition, Food, and Animal Sciences, University of Hawai'i at Mānoa, Honolulu, Hawai'i, USA.
Freezing extends the shelf life of foods but often leads to structural damage due to ice crystal formation, negatively impacting quality attributes. Oscillating magnetic field (OMF)-assisted supercooling has emerged as a potential technique to overcome these limitations by inhibiting ice nucleation and maintaining foods in a supercooled state. Despite its potential, the effectiveness and underlying mechanisms of OMF-assisted supercooling remain subjects of debate.
View Article and Find Full Text PDFElectrically Modulated Multilevel Optical Chirality in GdFeCo Thin Films.
ACS Appl Electron Mater
January 2025
Department of Applied Physics, National Pingtung University, No. 4-18, Minsheng Road, 90044 Pingtung, Taiwan.
This study introduces a simple approach to dynamically control multilevel optical ellipticity in ferrimagnetic GdFeCo alloys by switching the spin orientation through Joule heating induced by electrical current, with the assistance of a low magnetic field of 3.5 mT. It is demonstrated that selecting specific compositions of Gd (FeCo) alloys, with magnetic compensation temperatures near or above room temperature, allows for significant manipulation of the circular dichroism (CD) effect.
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