Abstract In a thin Weyl semimetal, thickness dependent Weyl-orbit quantum oscillation was proposed to exist, originating from nonlocal cyclotron orbit via electron tunnelings between top and bottom Fermi-arc surface states. Here, magneto-transport measurements were carried out on untwinned metal SrRuO 3 films. particular, oscillations with frequency F s1 ≈ 30 T identified, corresponding small Fermi pocket light effective mass. Its amplitude appears be at maximum for thicknesses in range of...

We present temperature dependent frequency shift and line broadening of phonon modes by insertion atomic layers Pb PbTe in the prototype 3D topological insulator Bi2Te3, using Raman spectroscopy. Good quality single crystals Pb2Bi2Te3, PbBi2Te4 PbBi4Te7 are grown modified Bridgman technique. The show progressive blue with decrease from 298 K to 93 is due anharmonic vibrations lattice as well increasing strength Bi-Te covalent interactions. Experimental results complemented extensive density...

We report low-frequency electrical resistance noise of Co <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">40</sub> Fe B xmlns:xlink="http://www.w3.org/1999/xlink">20</sub> /MgO/Co xmlns:xlink="http://www.w3.org/1999/xlink">60</sub> -based magnetic tunnel junction field sensors with reference and sensing layer magnetization directions along the out-of-plane in-plane directions, respectively. The devices are fabricated using sputter deposition...

Abstract We present a detail study of Shubinikov-de-Haas (SdH) oscillations accompanied by conductance fluctuations in mesoscopic topological insulator PbBi 4 Te 7 device. From SdH oscillations, the evidence Dirac fermions with π Berry phase is found and experimentally determined two main Fermi wave vectors are correlated to surface cones (buried one inside other) layered . have also fluctuations, root mean square amplitude which much higher than usual universal observed nanometer size...

The transport and single-particle scattering times characterizing a two-dimensional electron gas in back-gated GaAs/${\mathrm{Al}}_{\mathit{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$As modulation-doped heterostructure are investigated as function of the carrier density. For factor-of-3 change density, ratio time to relaxation is observed vary from 2 10. data agree with theoretical model(s) only if multiple small-angle events assumed be correlated.

Abstract Energy minimization plays an important role in structure determination and analysis of proteins, peptides, other organic molecules; therefore, development efficient algorithms is important. Recently, Morales Nocedal developed hybrid methods for large‐scale unconstrained optimization that interlace iterations the limited‐memory BFGS method (L‐BFGS) Hessian‐free Newton (Computat Opt Appl 2002, 21, 143–154). We test performance this approach as compared to those L‐BFGS algorithm Liu...

A detailed investigation of magnetic field alignment template released ferromagnetic nanowires has been undertaken. The distributions induced angular alignments Ni0.8Fe0.2, Co, and Ni grown by electro-deposition deposited onto substrates from a dilute suspension have investigated as function strengths up to ∼1 kOe. nominal diameter the is either ∼200 nm (Ni0.8Fe0.2) or ∼300 (Co Ni). percentage aligned within 0°–10° 0°–20° applied axis observed increase rapidly with increasing strength Oe,...

Here, we report an investigation of magnetic domain wall (DW) evolution and propagation in Y-shaped permalloy (Py) nanowire (NW) devices. The devices are fabricated using standard electron-beam lithography technique. Each device consists three connected NWs that form a Y-junction structure with one branch connecting either symmetrically or asymmetrically to circular disk for DW nucleation. dynamics the studied by situ force microscopy (MFM) pinning DWs triangular notches at each two We...

Here we report magnetotransport properties of Bi2−xSbxTe3−ySey (BSTS), In- and Sn-doped BSTS single crystals, grown through modified Bridgeman technique. crystals show bulk insulation in temperature dependency resistivity measurements are confirmed from the observed impurity band mediated three dimensional variable-range hopping behavior at low temperatures over virgin with metallic bulk. Magnetotransport for reveal a zero field sharp positive cusp is identified as two (2D) weak...

Amorphous alloys of (Fe/sub 1-x/Mn/sub x/)/sub 73.5/Si/sub 13.5/B/sub 9/Nb/sub 3/Cu/sub 1/, where x=0, 0.05, 0.10, 0.15, were prepared by vacuum melt-spinning. Anneals performed at or above the crystallization temperature led to formation a nanostructure primary phase is body centered cubic DO/sub 3/ FeSi embedded within an intergranular amorphous phase. The saturation induction x=0.05 alloy 1.19 T, slightly lower than parent alloy. Prolonged thermal aging enhancement in soft magnetic...

A maximum magnetoimpedance (∼66%) was observed at 5.2 MHz in a positive magnetostrictive glass-coated amorphous Co83.2Mn7.6Si5.8B3.3 microwire. Giant this microwire increased to 129% on short-duration heat treatment by passing four current pulses of amplitude 100 mA and each 12 s duration. Magnetoimpedance the as-quenched treated microwires investigated as function dc magnetic field Hdc within ±120 Oe frequency f up 12.85 MHz. The magnetization measurements samples indicated that increase...

Magnetic Barkhausen noise and hysteresis loops have been measured in the presence of various tensile stresses from three wire-shaped amorphous magnetic materials having different domain structures. Long duration large pulse indicates an inner core (IC) positive magnetostrictive glass-coated Co83.2Mn7.6Si5.8B3.3 Co58.59Fe4.41Ni10Si11B16 microwires where magnetization takes place by ∼180° rotation magnetization. This long is missing case low negative Co68.1Fe4.4Si12.5B15 wire indicating a...

Here, we investigate the size effect of perpendicular-anisotropic double-barrier magnetic tunnel junction (MTJ) devices embedded with iron nanoparticles. A sputtering system in conjunction postannealing process is employed to prepare sheet film and standard lithography techniques followed by ion etching technique are used fabricate micrometer submicrometer MTJ devices. strong ferromagnetic coupling observed as reduce device scale, which due reduction magnetostatic energy device. Furthermore,...

An analysis of structure and discrimination in simple chiral fluids is presented. The molecules consist a central carbon bonded to four distinct groups. Molecular-dynamics simulations have been performed on one-component fluid two racemic mixtures. For the racemates, discrimination, as measured by differences pair distribution functions, present but found be small. Intermolecular interaction energies are good predictors magnitude sign (mirror-image pairs favored) observed site–site...

Abstract The most important feature in topological insulators is the conducting surface states that support back scattered prohibited transport of charge carriers. We report weak antilocalization (WAL) effect mm size thick PbBi 4 Te 7 single crystal, evidence absence scattering Temperature dependency phase coherence length determined from modified Hikami–Larkin–Nagaoka (HLN) fitting WAL curves at different temperatures by considering electron–electron and electron–phonon interactions...

Kagome-lattice crystal is crucial in quantum materials research, exhibiting unique transport properties due to its rich band structure and the presence of nodal lines rings. Here, we investigate electronic perform first-principles calculations for Ni$_{3}$In$_{2}$Se$_{2}$ kagome topological semimetal. First-principle indicate six endless Dirac two rings with a $\pi$-Berry phase compound. The temperature-dependent resistivity dominated by scattering mechanisms: $s$-$d$ interband occurs below...

We have calculated the two-dimensional spatial distributions of several transport variables such as current density, carrier concentration, chemical potential, space-charge electric field, residual resitivity dipole potential and electromigration forces in disordered mesoscopic structures subjected to arbitrary magnetic fields. These fully quantum mechanical calculations shed new light on magnetotransport phenomena integer Hall effect, formation bound states, response curent vortices caused...

We report a systematic experimental investigation of single-particle lifetimes in quasi-one-dimensional structures. The were measured GaAs quantum wires variable width and carrier density. Experimental data show excellent agreement with theoretical estimates that use single fitting parameter. also suggest the dominant relaxation mechanism for excitations these structures at low temperature is remote impurity scattering. Additionally, we find electrostatic confining potential along parabolic...

Double barrier Magnetic tunnel junction (DBMTJ) is an attractive issue in the field of spintronics due to potential applications, such as spin diode [1], magnetic sensor [2], and non-volatile spin-transfer-torque random access memories [3]. Essentially, DB structures give rise a high filtering efficiency, thus not only enhancing tunneling magnetoresistance (TMR) ratio but also improving MR decay raising bias voltage. Therefore, many efforts have been devoted investigating specific phenomena...