Imaging Nucleation and Propagation of Pinned Domains in Few-Layer FeGeTe.

Engineering nontrivial spin textures in magnetic van der Waals materials is highly desirable for spintronic applications based on hybrid heterostructures. The recent observation of labyrinth and bubble domains in the near room-temperature ferromagnet FeGeTe down to a bilayer thickness was thus a significant advancement toward van der Waals-based many-body physics. However, the physical mechanism responsible for stabilizing these domains remains unclear and requires further investigation.

Robust Weak Antilocalization Effect Up to ∼120 K in the van der Waals Crystal FeGeTe with Near-Room-Temperature Ferromagnetism.

The van der Waals FeGeTe is a 3d ferromagnetic metal with a high Curie temperature of 275 K. We report herein the observation of an exceptional weak antilocalization (WAL) effect that can persist up to 120 K in an FeGeTe nanoflake, indicating the dual nature with both itinerant and localized magnetism of 3d electrons. The WAL behavior is characterized by the magnetoconductance peak around zero magnetic field and is supported by the calculated localized nondispersive flat band around the Fermi level.

Layer-Dependent Magnetic Domains in Atomically Thin FeGeTe.

Magnetic domain formation in two-dimensional (2D) materials gives perspectives into the fundamental origins of 2D magnetism and also motivates the development of advanced spintronics devices. However, the characterization of magnetic domains in atomically thin van der Waals (vdW) flakes remains challenging. Here, we employ X-ray photoemission electron microscopy (XPEEM) to perform layer-resolved imaging of the domain structures in the itinerant vdW ferromagnet FeGeTe which shows near room temperature bulk ferromagnetism and a weak perpendicular magnetic anisotropy (PMA).

Effect of (NH)ZrF, Voltage and Treating Time on Corrosion Resistance of Micro-Arc Oxidation Coatings Applied on ZK61M Magnesium Alloys.

The effects of (NH)ZrF concentration, voltage and treating time on the corrosion resistance of ZK61M magnesium alloy micro-arc oxidation coatings were studied by orthogonal experiments. The SEM result shows that the surface roughness and porosity of MAO coatings increased with (NH)ZrF concentration, voltage and treating time as a whole, except the porosity decreased with treating time. EDS, XRD and XPS analysis show that (NH)ZrF was successfully incorporated into coatings by reactive incorporation, coatings are dominantly composed of ZrO, MgO, MgF and amorphous phase Mg phosphate.

Magnetic critical behavior of the van der Waals FeGeTe crystal with near room temperature ferromagnetism.

The van der Waals ferromagnet FeGeTe has a Curie temperature T of about 270 K, which is tunable through controlling the Fe deficiency content and can even reach above room temperature. To achieve insights into its ferromagnetic exchange that gives the high T, the critical behavior has been investigated by measuring the magnetization in FeGeTe crystal around the ferromagnetic ordering temperature. The analysis of the measured magnetization by using various techniques harmonically reached to a set of reliable critical exponents with T = 273.

Effect of Diffusion Annealing Temperature on the Formation Process and Properties of a Carbon-Aluminum Composite Layer on Pure Titanium.

A carbon-aluminum composite layer was prepared on the surface of pure titanium by double glow plasma carburizing, magnetron sputtering aluminizing, and vacuum-diffusional annealing treatment. The microstructure, phase composition, and properties of the composite layer obtained at different annealing temperatures were investigated by scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and the ball-on-disc wear method. Results showed that the layer contained a mixture of TiAl, TiAl, and TiC phases at 650 °C for 6 h, which can significantly enhance the hardness and wear resistance of pure titanium.

Morphology and Wear Resistance of Composite Coatings Formed on a TA2 Substrate Using Hot-Dip Aluminising and Micro-Arc Oxidation Technologies.

Aluminium layers were coated onto the surface of pure titanium using hot-dip aluminising technology, and then the aluminium layers were in situ oxidised to form oxide ceramic coatings, using the micro-arc oxidation (MAO) technique. The microstructure and composition distribution of the hot-dip aluminium coatings and ceramic layers were studied by using scanning electron microscopy and energy-dispersive X-ray spectroscopy. The phase structure of the MAO layers was studied using X-ray diffraction.

Parity-time symmetry in periodically curved optical waveguides.

The coupling strength between two parity-time (PT) symmetric resonators determines whether the PT phase is broken or not. Here we investigate the scenario that two optical waveguides are spatially curved so that they switch periodically between unbroken and broken PT phases. We show that the existence of locally broken PT phase does not necessarily render a broken phase to waves propagating inside.

Influence of KMnO₄ Concentrationon Infrared Emissivity of Coatings Formed on TC4 Alloys by Micro-Arc Oxidation.

Ceramic coatings with high emissivity were fabricated on TC4 alloys by micro-arc oxidation technique (MAO) in mixed silicate and phosphate electrolytes with varying KMnO₄ addition. The microstructure, phase and chemical composition were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), and the infrared emissivity of the MAO coatings was measured in a waveband of 5-20 μm. The results show that the thickness of the coatings increased with the addition of KMnO₄, but the roughness of the coatings first decreased and then increased slightly due to the inhibitory effect of KMnO₄ on Na₂SiO₃ deposition.

[Time of salvage treatment on sudden sensorineural hearing loss].

Objective: To explore the best time of intratympanic dexamethasone injection to treat sudden sensorineural hearing loss (SSNHL) as salvage therapy so that to improve the curative efficacy on sudden deafness at the utmost.

Method: A total of 192 patients with SSNHL were included in this study, among whom 63 cases received the systemic steroid therapy throughout the study, while the other ones were treated with systemic steroid as initial treatment and were given intratympanic steroid administration as salvage treatment starting at different time point. The salvage treatment started on the 3rd day after the beginning of the initial treatment for 29 cases, on the 7th day for 38 cases, on the 14th day for 43 cases, and 1 month later for 19 cases.

[The effect of hyperbaric oxygen therapy to different degree of hearing loss and types of threshold curve in sudden deafness patients].

Objective: To investigate the effect of hyperbaric oxygen therapy to different degrees of hearing loss and different types of threshold curve in sudden deafness patients, and establish a personalized therapy, so as to promote clinical effect to sudden deafness.

Method: One hundred and twenty cases were divided into two groups respectively (each group 60 cases). Drug treatment had been used in group A for two weeks.

[Choice of treatment plan and operation time on pediatric chronic sinusitis].

Objective: To explore the curative effect of pediatric chronic sinusitis and analyze its relative factors, so that the best treatment plan and operation time can be choose.

Method: Two hundred and twenty cases of pediatric chronic sinusitis were divided into 4 groups: group A with only simple chronic sinusitis, group B accompanied adenoid hypertrophy. Among group B, group B1 with no nasal cavity structural abnormalities but group B2 on the contrary.

[The value of cyclooxygenase-2 to predict the effect of radiotherapy in nasopharyngeal carcinoma].

Objective: To investigate the relation between the expression of COX-2 protein and the effect of radiotherapy, estimate the value of COX-2 in predicting the effect of radiotherapy in patients with nasopharyngeal carcinoma,provide theoretical basement for establishing characteristic project of treatment and raising curative effect and life quantity.

Method: The expression of COX-2 protein was examined in 30 radiosensitive and 30 radioresistant poorly differentiated NPC by immunohistochemical staining (SP method) before radiotherapy. The relation between the expression of COX-2 and the effect of radiotherapy was analyzed.

[Blood vessel multiply and significance of expression of Cox-2, VEGF in pterygium].

Objective: To investigate the role of cyclooxygenases-2 (Cox-2) and vascular endothelial growth factor (VEGF) in the occurrence and development of human pterygium.

Methods: The immunohistochemical elivision method was used to examine the expressions of Cox-2 and VEGF in 30 cases of pterygium and 15 cases with normal conjunctiva.

Results: The positive rate of Cox-2 was 42.

[Evidence-based treatment of secretory otitis media in patients with nasopharyngeal carcinoma after radiotherapy].

Objective: According to the principle of Evidence-Based Medicine (EBM), to analyse the cause of SOM in patients with nasopharyngeal carcinoma (NPC) after radiotherapy and to explore the effective treatment methods of SOM in patients with NPC after radiotherapy.

Method: One hundred and six cases (112 ears) of SOM in patients with NPC after radiotherapy were treated with comprehensive management,e. g application of general and local antibiotics,nerves nutrition medicine, blood vessel dilating drugs and hormone, reinforced clearance of nasal cavities and nasopharynx and treatment of the disease of nasal cavities and sinuses, in addition to inserting catheter into the tympanum and intratympanic application of medicine through the eustachian tube.

[The features of auditory brainstem response in patients with obstructive sleep apnea-hypopnea syndrome].

Objective: To investigate the effects and causes of obstructive sleep apnea-hypopnea syndrome (OSAHS) on auditory pathway, the changes of auditory brainstem response (ABR) were analyzed.

Method: With the use of polysomnography,72 snorers were examined and divided into OSAHS and non- OSAHS groups. These two groups patients and a group of normal person were underwent ABR measuring.

[Implantation of complex tissue flap for atrophic rhinitis].

Objective: To improve the treatment effect of atrophic rhinitis.

Method: Twenty-one cases (thirty-one sides) of atrophic rhinitis were treated by implantation of complex tissue flap to narrow the nasal cavity.

Result: Short-term effective treatment results were 100% (21/21), long-term effective treatment results were 90.

[Association between the shape alteration of pharyngeal ostium of eustachian tube and secretory otitis media].

Objective: To investigate the association between the shape alteration of pharyngeal ostium of eustachian tube and secretory otitis media (SOM).

Method: Two hundred and twelve pharyngeal ostiums of eustachian tube were observed by using rhinopharyngoscope and divided into two groups: the contrast's and the secretory otitis media's, and all the shape of pharyngeal ostium of eustachian tube were divided into triangular type, cravice type, elliptical type and bell type.

Result: The shape of pharyngeal ostium of eustachian tube are remarkablely difference with the normal group and the diseased group.

[Relationship between adenoids hypertrophy and secretory otitis media].

Objective: To investigae the cause of secretory otitis media resulting from adenoids hypertrophy and the relationship between adenoids hypertrophy and secretory otitis media.

Method: According to the grades of adenoids hypertrophy, 140 children were divided into two groups: the group of middle-grade and the group of pathological hypertrophy. The effect about the degree of adenoids hypertrophy resulted in the descendent of middle ear function and the difference of incidence of secretory otitis media were analyzed.