Modern Physics Letters B

The adhesion of manganese silicide (MnSi_x) films on silicon and glass substrates is studied by using the micro-scratch method. The films were prepared by electron beam evaporation and thermal evaporation. To improve adhesion of the films, several techniques including ion bombardment, increasing substrate temperature, and insertion of a silicon intermediate layer were used. Finally, adherent MnSi_x(x~1.7) films were prepared through solid phase reaction as well as reactive deposition. The hardness and modulus of the MnSi_x(x~1.7) film were measured by a nano-indenter and the values are 8.8±1.0 GPa and 141±15 GPa, respectively.

Our calculations, based on first principles, have shown that magnetism from two manganese atoms embedded in the surface layer of Cu(001) depends on their relative positions. If the two Mn atoms are nearest neighbors, the magnetic moment for either atom is only 0.49μ_B. If separated by one lattice constant, each of the two Mn atoms has a larger moment of 0.66μ_B and the surrounding Cu atoms also acquire substantial moments. Finally, when a Cu atom is interposed between the two Mn atoms, moment for each Mn atom increases to 3.71μ_B, about the value of a single Mn impurity in the surface layer. The results indicate that a strong d–d interaction between the Mn and Cu atoms and a weaker interaction between the Mn atoms are behind the shifting of energy levels for the majority and minority spins, which in turn results in very different magnetic moments.

Ordered nanopatterns that match to the {6, 4} tiling of the diamond type infinite periodic minimal surface are generated. The construction of the unit cell, generally recognized as a Monkey Saddle, is done numerically using the exact Weierstrass–Enneper representation of minimal surfaces. The obtained patterns are a good model for the self-assembly nanodomain organizations of membrane proteins, compatible with 3- or 6-fold symmetries and formed upon reconstitution in bicontinuous cubic lipid phases.

EPR and magnetic susceptibility measurements have been performed on xFe₂O₃·(100-x) [3B₂O₃·CaO] glasses with 0<x≤40 mol%.

The Fe³⁺ ions in sites of distorted octahedral symmetry and clustered formations containing both Fe³⁺ and Fe²⁺ ionic species were found. Dipolar and magnetic super-exchange interactions involving iron ions were revealed to depend on the iron content of the sample.

We construct a general supersymmetric quantum transformation for studying the supersymmetric quadratic Hamiltonian which contains the interaction of multi-mode fermions with multi-mode bosons. The Hamiltonian can be derived from that of multi-mode radiation field interacting with m two-level atoms. By using the supersymmetric quantum transformation, the diagonolized Hamiltonian is given. We also concisely derive the analytic expression of the super-partition function for the supersymmetric quadratic Hamiltonian without knowing the energy spectrum.