Current magnetic memories are based on writing and reading out the domains with opposite orientation of the magnetization vector.Alternatively,information can be encoded in regions with a different value of the satura...Current magnetic memories are based on writing and reading out the domains with opposite orientation of the magnetization vector.Alternatively,information can be encoded in regions with a different value of the saturation magnetization.The latter approach can be realized in principle with chemical order-disorder transitions in intermetallic alloys.Here,we study such transformations in a thin-film(35 nm)Fe60Al40 alloy and demonstrate the formation of periodic magnetic nanostructures(PMNS)on its surface by direct laser interference patterning(DLIP).These PMNS are nonvolatile and detectable by magnetic force microscopy(MFM)at room temperature after DLIP with a single nanosecond pulse.We provide different arguments that the PMNS we observe originate from increasing magnetization in maxima of the interference pattern because of chemical disordering in the atomic lattice of the alloy at temperatures T higher than the critical temperature Tc for the order(B2)-disorder(A2)transition.Theoretically,our simulations of the temporal evolution of a partially ordered state at T>Tc reveal that the disordering rate is significant even below the melting threshold.Experimentally,we find that the PMNS are erasable with standard thermal annealing at T<Tc.展开更多
In present paper we develop the description of massless fields on the basis of space-time algebra of sixteen-component sedeons. The generalized sedeonic second-order equation for unified gravito-electromagnetic (GE) f...In present paper we develop the description of massless fields on the basis of space-time algebra of sixteen-component sedeons. The generalized sedeonic second-order equation for unified gravito-electromagnetic (GE) field describing simultaneously weak gravity and electromagnetism is proposed. The relations for the GE field energy, momentum and Lorentz invariants are derived. The special case of GE field described by first-order sedeonic wave equation is also discussed.展开更多
We present an alternative sixteen-component hypercomplex scalar-vector values named “space-time sedenions”, generating associative noncommutative space-time Clifford algebra. The generalization of relativistic quant...We present an alternative sixteen-component hypercomplex scalar-vector values named “space-time sedenions”, generating associative noncommutative space-time Clifford algebra. The generalization of relativistic quantum mechanics and field theory equations based on sedenionic wave function and space-time operators is discussed.展开更多
Thin epitaxial films of the palladium-rich Pd_(1-x)Fe_(x) alloy were synthesized and extensively studied as a tunable ferromagnetic material for superconducting spintronics. The(001)-oriented Mg O single-crystal subst...Thin epitaxial films of the palladium-rich Pd_(1-x)Fe_(x) alloy were synthesized and extensively studied as a tunable ferromagnetic material for superconducting spintronics. The(001)-oriented Mg O single-crystal substrate and the composition range of x = 0.01–0.07 were chosen to support the epitaxial growth and provide the films with magnetic properties spanning from very soft ferromagnet for memory applications to intermediately soft and moderately hard for the programmable logic and circuit biasing, respectively. Dependences of the saturation magnetization, Curie temperature and three magnetic anisotropy constants on the iron content x were obtained for the first time from the analyses of the magnetometry and ferromagnetic resonance data. The experimental results were discussed based on existing theories of dilute ferromagnetic alloys. Simulation of the hysteresis loops within the Stoner-Wohlfarth model indicates the predominant coherent magnetic moment rotation at cryogenic temperatures. The obtained results were compiled in a database of magnetic properties of a palladium-iron alloy in a single-crystal thin-film form considered as a material for superconducting spintronics.展开更多
文摘Current magnetic memories are based on writing and reading out the domains with opposite orientation of the magnetization vector.Alternatively,information can be encoded in regions with a different value of the saturation magnetization.The latter approach can be realized in principle with chemical order-disorder transitions in intermetallic alloys.Here,we study such transformations in a thin-film(35 nm)Fe60Al40 alloy and demonstrate the formation of periodic magnetic nanostructures(PMNS)on its surface by direct laser interference patterning(DLIP).These PMNS are nonvolatile and detectable by magnetic force microscopy(MFM)at room temperature after DLIP with a single nanosecond pulse.We provide different arguments that the PMNS we observe originate from increasing magnetization in maxima of the interference pattern because of chemical disordering in the atomic lattice of the alloy at temperatures T higher than the critical temperature Tc for the order(B2)-disorder(A2)transition.Theoretically,our simulations of the temporal evolution of a partially ordered state at T>Tc reveal that the disordering rate is significant even below the melting threshold.Experimentally,we find that the PMNS are erasable with standard thermal annealing at T<Tc.
文摘In present paper we develop the description of massless fields on the basis of space-time algebra of sixteen-component sedeons. The generalized sedeonic second-order equation for unified gravito-electromagnetic (GE) field describing simultaneously weak gravity and electromagnetism is proposed. The relations for the GE field energy, momentum and Lorentz invariants are derived. The special case of GE field described by first-order sedeonic wave equation is also discussed.
文摘We present an alternative sixteen-component hypercomplex scalar-vector values named “space-time sedenions”, generating associative noncommutative space-time Clifford algebra. The generalization of relativistic quantum mechanics and field theory equations based on sedenionic wave function and space-time operators is discussed.
文摘Thin epitaxial films of the palladium-rich Pd_(1-x)Fe_(x) alloy were synthesized and extensively studied as a tunable ferromagnetic material for superconducting spintronics. The(001)-oriented Mg O single-crystal substrate and the composition range of x = 0.01–0.07 were chosen to support the epitaxial growth and provide the films with magnetic properties spanning from very soft ferromagnet for memory applications to intermediately soft and moderately hard for the programmable logic and circuit biasing, respectively. Dependences of the saturation magnetization, Curie temperature and three magnetic anisotropy constants on the iron content x were obtained for the first time from the analyses of the magnetometry and ferromagnetic resonance data. The experimental results were discussed based on existing theories of dilute ferromagnetic alloys. Simulation of the hysteresis loops within the Stoner-Wohlfarth model indicates the predominant coherent magnetic moment rotation at cryogenic temperatures. The obtained results were compiled in a database of magnetic properties of a palladium-iron alloy in a single-crystal thin-film form considered as a material for superconducting spintronics.
