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- Commensurate lattices (1)
- Dative bonds (1)
- Dipolar modeling (1)
- Dzyaloshinskii-Moriya interaction (1)
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- Magnetic hysteresis (1)
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Articles 1 - 6 of 6
Full-Text Articles in Physics
Dative Epitaxy Of Commensurate Monocrystalline Covalent Van Der Waals Moiré Supercrystal, Mengying Bian, Liang Zhu, Xiao Wang, Junho Choi, Rajesh V. Chopdekar, Sichen Wei, Lishu Wu, Chang Huai, Austin Marga, Qishuo Yang, Yuguang C. Li, Fei Yao, Ting Yu, Scott A. Crooker National High Magnetic Field Laboratory, Los Alamos National Laboratory, Xuemei Cheng, Renat F. Sabirianov, Shengbai Zhang, Junhao Lin, Yanglong Hou, Hao Zeng
Dative Epitaxy Of Commensurate Monocrystalline Covalent Van Der Waals Moiré Supercrystal, Mengying Bian, Liang Zhu, Xiao Wang, Junho Choi, Rajesh V. Chopdekar, Sichen Wei, Lishu Wu, Chang Huai, Austin Marga, Qishuo Yang, Yuguang C. Li, Fei Yao, Ting Yu, Scott A. Crooker National High Magnetic Field Laboratory, Los Alamos National Laboratory, Xuemei Cheng, Renat F. Sabirianov, Shengbai Zhang, Junhao Lin, Yanglong Hou, Hao Zeng
Physics Faculty Research and Scholarship
Realizing van der Waals (vdW) epitaxy in the 1980s represents a breakthrough that circumvents the stringent lattice matching and processing compatibility requirements in conventional covalent heteroepitaxy. However, due to the weak vdW interactions, there is little control over film qualities by the substrate. Typically, discrete domains with a spread of misorientation angles are formed, limiting the applicability of vdW epitaxy. Here, the epitaxial growth of monocrystalline, covalent Cr5Te8 2D crystals on monolayer vdW WSe2 by chemical vapor deposition is reported, driven by interfacial dative bond formation. The lattice of Cr5Te8, with a lateral dimension of a few tens of micrometers, …
Impact Of The Electron Density And Temperature Gradient On Drift-Wave Turbulence In The Large Plasma Device, Conor Perks, Saskia Mordijck, Troy Carter, Bart Van Compernolle, Stephen Vincena, Giovanni Rossi, David A. Schaffner
Impact Of The Electron Density And Temperature Gradient On Drift-Wave Turbulence In The Large Plasma Device, Conor Perks, Saskia Mordijck, Troy Carter, Bart Van Compernolle, Stephen Vincena, Giovanni Rossi, David A. Schaffner
Physics Faculty Research and Scholarship
In this paper we present an experimental study of edge turbulence in the Large Plasma Device at UCLA. We utilize a scan of discharge power and prefill pressure (neutral density) to show experimentally that turbulent density fluctuations decrease with decreasing density gradient, as predicted for resistive drift-wave turbulence (RDWT). As expected for RDWT, we observe that the cross-phase between the density and potential fluctuations is close to 0. Moreover, the addition of an electron temperature gradient leads to a reduction in the amplitude of the density fluctuations, as expected for RDWT. However, counter to theoretical expectations, we find that the …
The Effect Of Polymer Stiffness On Magnetization Reversal Of Magnetorheological Elastomers, Andy T. Clark, David Marchfield, Zheng Cao, Tong Dang, Nan Tang, Dustin Gilbert, Elise A. Corbin, Kristen S. Buchanan, Xuemei Cheng
The Effect Of Polymer Stiffness On Magnetization Reversal Of Magnetorheological Elastomers, Andy T. Clark, David Marchfield, Zheng Cao, Tong Dang, Nan Tang, Dustin Gilbert, Elise A. Corbin, Kristen S. Buchanan, Xuemei Cheng
Physics Faculty Research and Scholarship
Ultrasoft magnetorheological elastomers (MREs) offer convenient real-time magnetic field control of mechanical properties that provides a means to mimic mechanical cues and regulators of cells in vitro. Here, we systematically investigate the effect of polymer stiffness on magnetization reversal of MREs using a combination of magnetometry measurements and computational modeling. Poly-dimethylsiloxane- based MREs with Young’s moduli that range over two orders of magnitude were synthesized using commercial polymers SylgardTM 527, Sylgard 184, and carbonyl iron powder. The magnetic hysteresis loops of the softer MREs exhibit a characteristic pinched loop shape with almost zero remanence and loop widening at intermediate fields …
Persistent Opto-Ferroelectric Responses In Molecular Ferroelectrics, Xuanyuan Jiang, Xiao Wang, Pratyush Buragohain, Andy T. Clark, Haidong Lu, Shashi Poddar, Le Yu, Anthony D. Dichiara, Alexei Gruverman, Xuemei Cheng, Xiaoshan Xu
Persistent Opto-Ferroelectric Responses In Molecular Ferroelectrics, Xuanyuan Jiang, Xiao Wang, Pratyush Buragohain, Andy T. Clark, Haidong Lu, Shashi Poddar, Le Yu, Anthony D. Dichiara, Alexei Gruverman, Xuemei Cheng, Xiaoshan Xu
Physics Faculty Research and Scholarship
Persistent photoresponses require optical excitations to metastable states, which are rare of ionic origin due to the indirect photon-ion interaction. In this work, we explore the photoinduced metastable proton states in the proton-transfer type molecular ferroelectric croconic acid. We observe that, after the photoexcitation, the changes of structural and ferroelectric properties relax in ∼10^3s, indicating persistent photoresponses of ionic origin. In contrast, the photoconductivity relaxes within 1 s. The 10^3s timescale suggests that the ionic metastable states result from proton transfer both along and out of the hydrogen bonds. This discovery unveils an ionic mechanism for the phototunability, which offers …
Topological Spin Memory Of Antiferromagnetically Coupled Skyrmion Pairs In Co/Gd/Pt Multilayers, Xiao Wang, Alexandra R. Stuart, Mitchell S. Swyt, Carla M. Quispe Flores, Andy T. Clark, Adzo Fiagbenu, Rajesh V. Chopdekar, Pavel N. Lapa, Zhuyun Xiao, Dava Keavney, Richard Rosenberg, Michael Vogel, John E. Pearson, Suzanne G. E. Te Velthius, Axel Hoffmann, Kristen S. Buchanan, Xuemei Cheng
Topological Spin Memory Of Antiferromagnetically Coupled Skyrmion Pairs In Co/Gd/Pt Multilayers, Xiao Wang, Alexandra R. Stuart, Mitchell S. Swyt, Carla M. Quispe Flores, Andy T. Clark, Adzo Fiagbenu, Rajesh V. Chopdekar, Pavel N. Lapa, Zhuyun Xiao, Dava Keavney, Richard Rosenberg, Michael Vogel, John E. Pearson, Suzanne G. E. Te Velthius, Axel Hoffmann, Kristen S. Buchanan, Xuemei Cheng
Physics Faculty Research and Scholarship
Antiferromagnetically (AFM) coupled skyrmions offer potential advantages for spintronic devices, including reduced dipolar fields that may enable smaller skyrmion sizes and a reduction of the skyrmion Hall effect. However, the topological stability of AFM-coupled skyrmions subjected to dramatic spin deformation through low-temperature cycling has not been investigated. Here we report the discovery of a topological spin memory effect for AFM-coupled skyrmion pairs in [Co/Gd/Pt]10 multilayered films. Photoemission electron microscopy imaging shows that bubble skyrmions in the multilayer that are stable at room temperature evolve into complex in-plane spin textures as the temperature is lowered and reform completely when the sample …
Measurement Of The Taylor Scale In A Magnetized Turbulent Laboratory Plasma Wind-Tunnel, Carlos A. Cartagena-Sanchez, Joshua M. Carlson, David A. Schaffner
Measurement Of The Taylor Scale In A Magnetized Turbulent Laboratory Plasma Wind-Tunnel, Carlos A. Cartagena-Sanchez, Joshua M. Carlson, David A. Schaffner
Physics Faculty Research and Scholarship
The fluid Taylor scale is measured in the Bryn Mawr Experiment (BMX) of the Bryn Mawr Plasma Laboratory and examined as a potential dissipation scale of magnetic turbulence within the plasma. We present the first laboratory measurements of the Taylor scale of a turbulent magnetized plasma through multi-point correlations of broadband magnetic fluctuations. From spatial and temporal correlations, respectively, the measured Taylor scales are 261 and 361 cm. These measurements are on the same order of magnitude as estimated ion dissipation scales within the BMX plasma with ion inertial scales between 1 and 10 cm and ion gyroscales between 0:1 …