Perpendicular magnetic anisotropy in bulk and thin-film CuMnAs for antiferromagnetic memory applications

CuMnAs with perpendicular magnetic anisotropy is proposed as an active material for antiferromagnetic memory. Information can be stored in the antiferromagnetic domain state, while writing and readout can rely on the existence of the surface magnetization. It is predicted, based on first-principles calculations, that easy-axis anisotropy can be achieved in bulk CuMnAs by substituting a few percent of As atoms by Ge, Si, Al, or B. This effect is attributed to the changing occupation of certain electronic bands near the Fermi level induced by the hole doping. The calculated temperature dependence of the magnetic anisotropy does not exhibit any anomalies. Thin CuMnAs(001) films are also predicted to have perpendicular magnetic anisotropy.Comment: 5 pages, 8 figure

Origin of spin reorientation transitions in antiferromagnetic MnPt-based alloys

Antiferromagnetic MnPt exhibits a spin reorientation transition (SRT) as a function of temperature, and off-stoichiometric Mn-Pt alloys also display SRTs as a function of concentration. The magnetocrystalline anisotropy in these alloys is studied using first-principles calculations based on the coherent potential approximation and the disordered local moment method. The anisotropy is fairly small and sensitive to the variations in composition and temperature due to the cancellation of large contributions from different parts of the Brillouin zone. Concentration and temperature-driven SRTs are found in reasonable agreement with experimental data. Contributions from specific band-structure features are identified and used to explain the origin of the SRTs.Comment: 6 pages, 8 figure

PSYCHOLOGICAL AND PEDAGOGICAL ASPECTS OF PREPARING A MUSICAL ARTIST FOR CONCERT PERFORMANCES

В статье рассматривается такое специфическое явление для музыканта-исполнителя как сценическое волнение. Выдающиеся музыканты предлагают способы преодоления избыточного сценического волненияIn the current article we are reviewing a stage distress, which is a specific for performers. Prominent performers describe various customs on how to overcome excessive stage agitatio

Personality and individuality: their place in the art of interpretation

The article raises the problem of determining the concepts of personality and individuality and their expression in the creative work of performing musicians. The authors analyze thoughts and opinions of outstanding performers, teachers and composers about these concepts and come to the conclusion that personality traits acquired by a musician during his or her lifetime, their life experience, and spiritual development are the source of individuality in the artist’s workВ статье ставится задача определения двух понятий «личность» и «индивидуальность» и их проявления в творчестве музыкантов-исполнителей. Авторы анализируют мысли и высказывания выдающихся исполнителей, педагогов и композиторов, связанные с этими понятиями и делают вывод, что качества личности, приобретенные музыкантом в процессе жизни, его жизненный опыт, духовный уровень являются источником индивидуальности в его творчеств

Phase stability, ordering tendencies, and magnetism in single-phase fcc Au-Fe nanoalloys

Bulk Au-Fe alloys separate into Au-based fcc and Fe-based bcc phases, but L1$_0$ and L1$_2$ orderings were reported in single-phase Au-Fe nanoparticles. Motivated by these observations, we study the structural and ordering energetics in this alloy by combining density functional theory (DFT) calculations with effective Hamiltonian techniques: a cluster expansion with structural filters, and the configuration-dependent lattice deformation model. The phase separation tendency in Au-Fe persists even if the fcc-bcc decomposition is suppressed. The relative stability of disordered bcc and fcc phases observed in nanoparticles is reproduced, but the fully ordered L1$_0$ AuFe, L1$_2$ Au$_3$Fe, and L1$_2$ AuFe$_3$ structures are unstable in DFT. However, a tendency to form concentration waves at the corresponding [001] ordering vector is revealed in nearly-random alloys in a certain range of concentrations. This incipient ordering requires enrichment by Fe relative to the equiatomic composition, which may occur in the core of a nanoparticle due to the segregation of Au to the surface. Effects of magnetism on the chemical ordering are also discussed.Comment: 23 pages, 11 figure