Theory of stripe domains in magnetic shape memory alloys

The evolution of multivariant patterns in thin plates of magnetic shape memory materials with an applied magnetic field was studied theoretically. A geometrical domain-model is considered composed of straight stripe-like martensite variants with constant internal magnetization (high anisotropy limit) and magnetic domain wall orientation fixed by the twin boundaries. Through integral transforms of the demagnetization energy, the micromagnetic energy is cast into a form convenient for direct numerical evaluation and analytical calculations. The equilibrium geometrical parameters of multivariant patterns with straight and oblique twin boundaries have been derived as functions of the applied field and the material parameters of a plate. It is shown that the oblique multivariant states exist only in plates with thicknesses L larger than a certain critical value L_0. In samples with L < L_0 a magnetic-field-driven transformation occurs directly between single variant states.Comment: Materials for E-MRS Fall Meeting, Warsaw 2007. Corrected figure

Exchange shift of stripe domains in antiferromagnetically coupled multilayers

Antiferromagnetically coupled multilayers with perpendicular anisotropy, as [CoPt]/Ru, Co/Ir, Fe/Au, display ferromagnetic stripe phases as the ground states. It is theoretically shown that the antiferromagnetic interlayer exchange causes a relative shift of domains in adjacent layers. This ``exchange shift'' is responsible for several recently observed effects: an anomalous broadening of domain walls, the formation of so-called ``tiger-tail'' patterns, and a ``mixed state'' of antiferromagnetic and ferromagnetic domains in [CoPt]/Ru multilayers. The derived analitical relations between the values of the shift and the strength of antiferromagnetic coupling provide an effective method for a quantitative determination of the interlayer exchange interactions.Comment: 4 pages, 3 figure

2020 Clinical practice guidelines for Myocarditis in adults

Russian Society of Cardiology (RSC)With the participation: Eurasian Association of Therapists (EUAT), Society of Specialists in Heart Failure (OSSN), Russian Scientific Medical Society of Therapists (RNMOT), Russian Society of Pathologists, Russian Society of Radiologists and Radiologists (RSR)Endorsed by: Research and Practical Council of the Ministry of Health of the Russian Federatio

RELAPSE PREVENTION AND IMPROVEMENT OF RESULTS OF COMPLEX ARRHYTHMIAS’ SURGICAL CORRECTION IN CARDIAC PATIENTS

Aim: To examine results of surgical intervention in cardiac surgery patients with atrial fibrillation after a loading pre-operative dose of amiodarone.Material and methods: The study included 49 cardiac patients with atrial fibrillation who underwent a surgery during a 14 months’ period in 2013–2014. Group 1 (n = 23) received preoperative amiodarone saturation at a dose 0.6–1.0 g daily with a maintenance dose 0.4 g daily in early postoperative period and at a dose 0.2 g daily up to 6 months after surgery. Group 2 (control, n = 26) was on a postoperative maintenance dose of amiodarone 0.6–1.0 g daily.Results: Stable sinus rhythm after left atrial Maze IV procedure was established in 44/49 of patients (90%). Atrial fibrillation relapsed in 1 patient from group 1 and in 4 patients from group 2. All 5 patients with recurrence of persistent atrial fibrillation had a long-term persistent arrhythmic history of more than 3 years, and echocardiography revealed left atrial dilatation of more than 6 cm.Conclusion: The use of saturating doses of amiodarone before surgery improves outcomes of left atrial Maze IV procedure (up to 95%), compared to those in the control group where amiodarone was used postoperatively (up to 85%)