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RKKY Exchange Bias Mediated Ultrafast All-Optical Switching of a Ferromagnet
The discovery of ultrafast helicity-independent all-optical switching (HI-AOS), as well as picosecond all-electrical switching of a ferrimagnet, has inspired the ultrafast spintronics community to explore ultrafast switching of a ferromagnet to achieve practical ultrafast storage and memory devices. Two explored mechanisms of HI-AOS of a ferromagnet in ferromagnet-ferrimagnet heterostructure are: a) exploiting the indirect exchange coupling with and b) injection of non-local spin current originated from a switching ferrimagnet. Here, in this manuscript, exchange mediated HI-AOS of a Ruderman–Kittel–Kasuya–Yosida (RKKY) exchange coupled “[Co/Pt]-multilayers/Pt spacer/CoGd” heterostructure is demonstrated. The authors have measured layer-resolved static magnetic properties, single-shot HI-AOS, and magnetization dynamics of the ferromagnetic Co/Pt multilayers (MLs), that are ferromagnetically or antiferromagnetically coupled with ferrimagnetic CoGd layers. Time-resolved magnetization dynamics reveal a 3.5 ps switching time of the Co/Pt MLs, which is the fastest switching of a ferromagnet reported to date. Employing an extended microscopic three-temperature model, the temporal dynamics of the exchange coupled ferromagnet–ferrimagnet heterostructure are simulated, qualitatively and quantitatively explaining the experimental switching phenomena. This work experimentally as well as theoretically establishes the mechanism of exchange mediated all-optical switching of ferromagnet-ferrimagnet heterostructures, which can be integrated with a magnetic tunnel junction for efficient reading after ultrafast energy-efficient switching.
Epitaxial Growth of Intermetallic MnPt Films on Oxides and Large Exchange Bias
We achieved a high-quality epitaxial growth of intermetallic MnPt films on oxides, with potential for multiferroic heterostructure applications. Also, antisite-stabilized spin-flipping induces ferromagnetism in MnPt films, although it is robustly antiferromagnetic in bulk. Moreover, highly ordered antiferromagnetic MnPt films exhibit superiorly large exchange coupling with a ferromagnetic layer.
Enhancing Low-Bias Performance of Hematite Photoanodes for Solar Water Splitting by Simultaneous Reduction of Bulk, Interface, and Surface Recombination Pathways
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Organic-Free Synthesis of a Highly Siliceous Faujasite Zeolite with Spatially-Biased Q 4 ( n Al) Si Speciation
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Enantioselective Electrophilic Trifluoromethylthiolation of β-Ketoesters: A Case of Reactivity and Selectivity Bias for Organocatalysis
A chiral Lewis base or a phase-transfer catalyst (PTC) can mediate the highly enantioselective trifluoromethylthiolation of β-ketoesters with the previously developed SCF 3 reagent (see scheme). Reactions of indanone-derived β-ketoesters occurred with high yield and excellent enantioselectivity with quinine as catalyst. In conclusion, reactions of tetralone- or 1-benzosuberone-derived β-ketoesters occurred with moderate to good enantioselectivity with a quinine-derived PTC.
Imaging Bias‐Driven Domain Wall Motion With Scanning Oscillator Piezoresponse Force Microscopy
Understanding ferroelectric domain wall dynamics at the nanoscale across a broad range of timescales requires measuring domain wall position under different applied electric fields. The success of piezoresponse force microscopy (PFM) as a tool to apply local electric fields at different positions and imaging their changing position, together with the information obtained from associated switching spectroscopies has fueled numerous studies of the dynamics of ferroelectric domains to determine the impact of intrinsic parameters such as crystalline order, defects and pinning centers, as well as boundary conditions such as environment. However, the investigation of sub-coercive reversible domain wall vibrational modes requires the development of new tools that enable visualizing domain wall motion under varying applied fields with high temporal and spatial resolution while also accounting for spurious electrostatic effects. Here, scanning oscillator piezoresponse force microscopy extends the investigation of domain wall dynamics to new regimes, providing direct visualization of domain wall position as a function of an external electric field that varies in time and location. In conclusion, this enables studying the energetics of field-driven ferroelectric domain wall motion, which is shown to obey a thermally activated flow regime in the millisecond timescale.
Benefits and biases of VHF and GPS telemetry: A case study of American alligator spatial ecology: Comparison of VHF and GPS Technology
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Statistical treatment for the wet bias in tree-ring chronologies: a case study from the Interior West, USA
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A Sterically Biased Unsymmetrical Azobenzene Derivative: Synthesis, Molecular Structure, and 15N NMR Spectroscopic Analysis of (E)-1-(2,6-Diisopropylphenyl)-2-phenyldiazine
We synthesized and characterized the title compound, (E)-1-(2,6-diisopropylphenyl)-2-phenyldiazine (I) using a combination of 1 H, 13 C, and 15 N NMR spectroscopy, infrared and UV/Vis spectroscopy, X-ray crystallography, and GC mass spectrometry. The solid-state structure is also reported. The unsymmetric azobenzene crystallizes in the space group P2 1 /c with unit cell parameters a = 8.001(7) Å, b = 17.827(16) Å, c = 11.129(10) Å, β = 101.960(10)°, V = 1553(2) Å 3 , Z = 4, D calc = 1.139 g/cm 3 .
Correction to: Exchange Bias Effect in FeCo Nanoparticles
In the original publication of the article, the authors forgot to acknowledge the financial support from The Graduate School Kasetsart University.
Austenite grain refinement during load-biased thermal cycling of a Ni49.9Ti50.1 shape memory alloy
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Helical dislocations: Observation of vacancy defect bias of screw dislocations in neutron irradiated Fe–9Cr
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Detecting drift bias and exposure errors in solar and photosynthetically active radiation data
Not Available
Biasing secondary particle interaction physics and production in MCNP6
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