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oe1(光电查) - 科学论文

13 条数据
?? 中文（中国） ▾

  • Bi2Te3 Topological Insulator for Domain-Wall Dark Pulse Generation from Thulium-Doped Fiber Laser

    摘要： We have experimentally demonstrated domain-wall (DW) dark pulses from a thulium-doped fiber laser incorporating a topological insulator saturable absorber (SA). The bulk-structured Bi2Te3 was used as the SA, which was constructed on a fiber ferrule platform through the deposition of the Bi2Te3 mixed with distilled water. The DW dark pulses were generated from the thulium-doped fiber laser cavity with a dual wavelength at 1956 nm and 1958 nm. The dark pulse width and the repetition rate were measured as ~10.3 ns and ~20.7 MHz over the pump power of ~80 mW, respectively. To the best of our knowledge, this work is the first demonstrated generation of the DW dark pulse from a thulium-doped fiber laser using nanomaterial-based SA.

    关键词： fiber lasers,Bi2Te3,topological insulator,domain-wall dark pulses

    更新于2025-11-28 14:23:57

  • Domain imaging in Fe-doped KNbO3 single crystal via trinocular microscopy and scanning electron microscopy

    摘要： Trinocular microscopy with a high spatial resolution is a promising technique for studying the surface morphology of materials. The cleavage face of ferroelectric Fe-doped K niobate (KNbO3) crystals was chemically etched by using HNO3. Trinocular microscopy was used to study the surface morphology of the grown ferroelectric KNbO3 single crystals. The grown surface of the crystal with a 60° domain wall revealed the same interaction and orientations. The results indicate that the type of domain walls that occur in ferroelectric crystals depend on the symmetry of both the nonferroelectric and ferroelectric phases of the crystal.

    关键词： Trinocular microscopy,Single crystal,Etching technique,Domain wall

    更新于2025-09-23 15:22:29

  • Depinning Field of Vortex Domain Wall in Wide Magnetic Wires with Asymmetric Notches Using Magneto-Optical Kerr Effect Microscopy

    摘要： We examined the pinning and depinning fields of the vortex domain wall (VDW) in wide permalloy wires to better understand VDW dynamic behavior. Our sample device has differently designed notches at the center of a 2-μm-wide wire. The notch depth ratio ranged from 0.2 to 0.8, and the asymmetric angles of the notches are 45°, 60°, and 75°. The depinning field was found to have two distribution ranges, similar to how the depinning field depends on VDW chirality in submicron size width wire. Our results also showed that the VDW depinning behavior of a wide wire is the same as that of a narrow wire. The asymmetric notch angle affected the depinning field, which was similar to the results of simulation with 400-nm wire. This suggests that the wide wire depinning field is similar to that of narrow wire.

    关键词： vortex domain wall,Magneto-optical Kerr effect microscopy,depinning field

    更新于2025-09-23 15:22:29

  • seed layers

    摘要： We characterize asymmetric growth of magnetic bubble domains in perpendicularly magnetized Co/Ni multilayers grown on PtxIr1?x seed layers by application of perpendicular and in-plane magnetic fields. Using a refined model of domain wall creep that incorporates contributions from the anisotropic elastic energy, ε, and a chirality-dependent prefactor, v0, we elucidate factors that govern the mobility of Dzyaloshinskii domain walls as a function of seed-layer composition. The interfacial Dzyaloshinskii-Moriya interaction (DMI) magnitude is found to decrease monotonically with xIr, which is independently confirmed by Brillouin light scattering. Moreover, the persistence of significant asymmetry in velocity curves across the full composition range supports previous assertions that a chirality-dependent attempt frequency akin to chiral damping could play a critical role in the observed trends. This work helps resolve fundamental questions about the factors governing Dzyaloshinskii domain-wall creep and demonstrates varying Pt-Ir seed-layer composition as a method to tune DMI.

    关键词： Dzyaloshinskii domain-wall creep,PtxIr1?x seed layers,Brillouin light scattering,interfacial Dzyaloshinskii-Moriya interaction,Co/Ni thin films

    更新于2025-09-23 15:21:21

  • Millimeter-sized magnetic domains in perpendicularly magnetized ferrimagnetic Mn <sub/>4</sub> N thin films grown on SrTiO <sub/>3</sub>

    摘要： The use of epitaxial layers for domain wall-based spintronic applications is often hampered by the presence of pinning sites. Here, we show that when depositing Mn4N (10 nm) epitaxial films, the replacement of MgO(001) by SrTiO3(001) substrates allows minimizing the misfit, and to obtain an improved crystalline quality, a sharper switching, a full remanence, a high anisotropy and remarkable millimeter-sized magnetic domains, with straight and smooth domain walls. In a context of rising interest for current-induced domain wall motion in rare-earth ferrimagnets, we show that Mn4N/SrTiO3, which is rare-earth free, constitutes a very promising ferrimagnetic system for current-induced domain wall motion.

    关键词： domain wall motion,Mn4N,ferrimagnetic,spintronics,SrTiO3

    更新于2025-09-23 15:21:21

  • Enhanced photovoltaic effects in ferroelectric solid solution thin films with nanodomains

    摘要： Domain structures in polar materials provide an additional degree of freedom to tune ferroelectric photovoltaic (PV) effects. One of the approaches to control domain structures is to form a solid solution with analogs in different symmetries. In this study, we investigate the influence of domain structures on the PV properties of ferroelectric thin films in the xBaTiO3–(1?x)BiFeO3 (BT–BFO) solid-solution system (x = 0.1 and 0.2). We found that a substitution of BT for BFO substantially decreases the domain size down to several tens of nanometers, leading to an enhanced PV response owing to a marked contribution of the domain-wall PV effect.

    关键词： solid solution,ferroelectric,photovoltaic,nanodomains,domain-wall PV effect

    更新于2025-09-23 15:21:01

  • Self-assembled shape evolution of the domain wall and formation of nanodomain wall traces induced by multiple IR laser pulse irradiation in lithium niobate

    摘要： The formation of the domain structure in congruent lithium niobate crystals by multiple pulse irradiation using an infrared laser was studied experimentally. The qualitative change of the domain wall shape with an increase of the pulse number was revealed. The chains of isolated nanodomains representing the domain wall traces appeared after each laser pulse irradiation in the samples with an irradiated polar surface covered by an indium–tin oxide layer. This effect allowed extraction of the detailed information about the evolution of the domain wall shape. The domain kinetics under the action of the pyroelectric field has been considered. The mechanism of the self-assembled shape evolution of the moving domain wall as a result of the local wall accelerations and retardations caused by the shape fluctuations (bumps and valleys) was proposed. The experimentally observed formation of the quasi-regular comb-like domain structures with randomly distributed bumps and valleys was confirmed by computer simulation. The discovered effects allowed us to create the stable random and quasi-regular domain structures and open the way for further development of the domain engineering methods.

    关键词： pyroelectric field,infrared laser,nanodomains,domain wall shape evolution,lithium niobate,domain structure

    更新于2025-09-23 15:19:57

  • Domain Wall Conduction in Calcium-Modified Lead Titanate for Polarization Tunable Photovoltaic Devices

    摘要： By virtue of the domain wall conduction and polarization tunable charge transport properties of ferroelectrics, Qian et al. theoretically demonstrate evidence of electric conduction in domain walls. They successfully fabricate Pb0.8Ca0.2TiO3-based photovoltaic devices with tunable photovoltaic performance by external poling.

    关键词： Pb0.8Ca0.2TiO3,Photovoltaic devices,Polarization tunable,Domain wall conduction,Ferroelectric

    更新于2025-09-23 15:19:57

  • Polarization domain wall solitons in a quasi-isotropic fibre laser using quantum dot tungsten disulfide

    摘要： A passively fast polarization switching erbium-doped fibre laser using quantum dot tungsten disulfide (QDWS2) as a saturable absorber (SA) has been proposed. It could generate polarization domain walls (PDWs). The PDWs’ spectrum can be divided into two separated spectra, which are orthogonally polarized. In detail, the horizontal polarization component wavelength is centred at 1561.1 nm with a repetition rate of 19.347 MHz, a pulse duration of 30 ns, and a signal-to-noise ratio of 73.2 dB at the maximum pump power. The vertical polarization component wavelength is centred at 1561.5 nm, with a pulse duration of 20.4 ns. To the best of our knowledge, this is the first report of a polarization domain wall generated by a QDWS2-SA. These results provide a platform to investigate anticorrelated polarization dynamics in quasi-isotropic fibre lasers. Moreover, their robustness and attractive properties could find potential applications in optical communications, data storage, and fibre laser devices.

    关键词： saturable absorber,polarization domain wall soliton,fibre laser

    更新于2025-09-19 17:13:59

  • Temperature-Dependent Domain Dynamics and Electrical Properties of Nd-doped Bi4Ti2.99Mn0.01O12 Thin Films in Fatigue Process

    摘要： Bi4Ti2.99Mn0.01O12 (BTM) thin films with different ratio of neodymium (Nd) doping were prepared on Pt(111)/Ti/SiO2/Si(100) substrates through a sol-gel method. The effects of Nd doping on domain dynamics and temperature-dependent fatigue behaviors of BTM thin films were systematically studied. The polarization fatigues of BTM (not doped) and Bi3.5Nd0.5Ti2.99Mn0.01O12 (BNTM05) thin films first get better with the increasing temperature (T) from 300 to 350 K and then become worse from 350 to 400 K, while Bi3.15Nd0.85Ti2.99Mn0.01O12 (BNTM85) thin films show enhanced fatigue endurance from 300 to 400 K. It can be shown that the long-range diffusion of oxygen vacancies in BTM thin film happens more easily through the impedance spectra analysis with T from 300 to 475 K, which can be verified by a lower activation energies (0.13–0.14 eV) compared to those of BNTM05 and BNTM85 (0.17–0.21 eV). Using a temperature-dependent piezoresponse force microscopy (PFM), we have found more responsive domain fragments in Nd-substituted films. The microscopic domain evolution from 298 to 448 K was done to further explain that the domain wall unpinning effect has been enhanced with increasing T. The correlation between microscopic domain dynamics and macroscopic electrical properties clearly demonstrates the effects of charged domain wall in Nd-doped BTM thin films during the fatigue tests.

    关键词： domain pinning,temperature-dependent fatigue,domain wall

    更新于2025-09-09 09:28:46