37 Result(s)

Chapter and Conference Paper

Antiferromagnetic-to-Ferromagnetic Transition in FeRh Thin Films with Strain Induced Nanostructure

The formation of a magnetic is reported in FeRh showing the antiferromagnetic-to-ferromagnetic (AF-to-FM) transition known from the B2 ordered equiatomic phase. The magnetic nanostructure is formed due to ...

R. Witte, R. Kruk, D. Wang, R. A. Brand… in Functional Nanostructures and Sensors for … (2020)

Article

Mössbauer spectroscopy and magnetization of ordered arrays of ultrathin FePt nanodisks with perpendicular magnetisation

The purpose of this communication is to show that arrays of FePt with perpendicular anisotropy can be studied using energy-selective conversion electron Mössbauer spectroscopy. Magnetic nanostructures have bee...

J. Ellrich, R. Kruk, R. A. Brand, H. Hahn, A. Hütten, Y. Lei in Hyperfine Interactions (2012)

Article

Atomic dynamics and interatomic interaction in quasicrystals

The previous experimental data on the partial spectra of thermal atomic vibrations in icosahedral (Al₆₂Cu_25.5Fe_12.5) and decagonal (Al_71.3Ni₂₄Fe_4.7) quasicrystals have been used to perform a comparative analysis ...

P. P. Parshin, M. G. Zemlyanov, R. A. Brand in Crystallography Reports (2011)

Article

Atomic dynamics of the α-(Al,Si)CuFe alloy: A crystalline approximant of a quasicrystal...

The atomic dynamics of the Al_0.550Si_0.070Cu_0.255Fe_0.125 alloy with the structure that approximates the structure of an icosahedral quasicrystal with a similar chemical composition has been investigated using inel...

P. P. Parshin, M. G. Zemlyanov, R. A. Brand, D. Pavlyuchkov… in Physics of the Solid State (2010)

Article

Low-energy lattice excitations in the decagonal Al-Ni-Fe and icosahedral Al-Cu-Fe quasicrystals and the (Al,Si)-Cu-Fe cubic phase

The specific heat of decagonal Al_71.3Ni_24.0Fe_4.7 and icosahedral Al₆₂Cu_25.5Fe_12.5 quasicrystals and the Al_55.0Si_7.0Cu_25.5Fe_12.5 cubic phase approximating the structure of the icosahedral alloy has been studied in...

G. Kh. Panova, M. G. Zemlyanov, P. P. Parshin, A. A. Shikov… in Physics of the Solid State (2010)

Article

Atomic dynamics of a d-AlNiFe decagonal quasicrystal

The atomic dynamics of an Al_71.3Ni₂₄Fe_4.7 decagonal quasicrystal has been investigated using the isotopic contrast method for inelastic neutron scattering. The partial vibrational spectra of the Ni, Fe, and Al at...

P. P. Parshin, M. G. Zemlyanov… in Journal of Experimental and Theoretical Ph… (2009)

Article

Interatomic force interaction in an i-AlCuFe quasicrystal

Partial spectra of thermal vibrations of Al, Cu, and Fe atoms in an icosahedral quasicrystal have been obtained by the isotopic-contrast method in inelastic neutron scattering. Joint analysis of these results ...

P. P. Parshin, M. G. Zemlyanov, R. A. Brand in Crystallography Reports (2007)

Article

Partial spectra of atomic thermal vibrations in decagonal and icosahedral quasicrystals

The atomic dynamics of an Al-Ni-Fe decagonal quasicrystal and an Al-Cu-Fe icosahedral quasicrystal are investigated experimentally using the isotopic contrast method in inelastic neutron scattering. The partia...

P. P. Parshin, M. G. Zemlyanov, R. A. Brand in Crystallography Reports (2007)

Article

Features of interatomic force interaction in an i-AlCuFe quasicrystal

Earlier experimental results on partial thermal vibrational spectra and on the atomic and electronic structure of icosahedral i-AlCuFe quasicrystals are used for analyzing the role of Al, Cu, and Fe atoms in inte...

P. P. Parshin, M. G. Zemlyanov, R. A. Brand in Journal of Experimental and Theoretical Ph… (2005)

Article

Modeling Deformation-Induced Fluid Flow in Cortical Bone’s Canalicular–Lacunar System

To explore the potential role that load-induced fluid flow plays as a mechano–transduction mechanism in bone adaptation, a lacunar–canalicular scale bone poroelasticity model is developed and implemented. The ...

S. Gururaja, H. J. Kim, C. C. Swan, R. A. Brand… in Annals of Biomedical Engineering (2005)

Article

Atomic dynamics of an Al_0.62Cu_0.255Fe_0.125 icosahedral quasicrystal

The atomic dynamics of an Al_0.62Cu_0.255Fe_0.125 icosahedral quasicrystal is investigated using inelastic neutron scattering (the isotopic contrast method). The partial vibrational spectra of copper, iron, and alum...

P. P. Parshin, M. G. Zemlyanov, A. V. Mashkov, R. A. Brand… in Physics of the Solid State (2004)

Article

Mössbauer study of hydrogenation effects in iron-rich intermetallics

M. Sorescu, F. Pourarian, R. A. Brand in Journal of Materials Science Letters (2003)

Article

Atomic-partial vibrational density of states of i-AlCuFe quasicrystals

We present new results on the separation of the atomic-partial vibrational density of states for the ternary quasicrystal i-Al₆₂Cu_25.5Fe_12.5. The decomposition into three atomic-partial functions, Al-, Cu- and Fe...

P.P. Parshin, M. Zemlyanov, R.A. Brand, A.-J. Dianoux, Y. Calvayrac in Applied Physics A (2002)

Article

A Broadband Viscoelastic Spectroscopic Study of Bovine Bone: Implications for Fluid Flow

To explore the hypothesis that mechanical excitation-induced fluid flow and/or fluid pressure are potential mechanical transduction mechanisms in bone adaptation, a complementary experimental and analytical mo...

P. M. Buechner, R. S. Lakes, C. Swan, R. A. Brand in Annals of Biomedical Engineering (2001)

Article

Phonon- and phason-dynamics in Al–Cu–Fe quasicrystals

The lattice dynamics of quasicrystals includes local phason jumps as well as phonons. Phason dynamics is important for the understanding of both the structure and atomic motion in quasicrystals, leading to sho...

R.A. Brand, J. Voss, Y. Calvayrac in Hyperfine Interactions (2000)

Chapter

Quasielastic Mössbauer Scattering in Stable Icosahedral Al-Cu-Fe Quasicrystals

Quasicrystals can show a new type of localised defect termed a “phason”. These defects are important for the understanding of both the structure and the atomic motion (diffusion). These defects lead to short-r...

R. A. Brand, J. Voss, Y. Calvayrac in Mössbauer Spectroscopy in Materials Science (1999)

Article

AlCuFe quasicrystals: Local electronic properties of these new industrial materials

We present room temperature ⁵⁷Fe Mössbauer centre (isomer) shift and electric field gradient (EFG) results in the Al_100-x-yCu_xFe_y icosahedral-quasicrystalline (i-) and crystalline phases. We have investigated the...

J. Pelloth, R.A. Brand, F. Hippert, Y. Calvayrac in Hyperfine Interactions (1998)

Article

New high-resolution electrostatic electron spectrometer for conversion electron Mössbauer spectroscopy

The construction and performance of a new electron spectrometer using an electrostatic 90°-spherical deflection analyzer (SDA) is described. The spectrometer is suited for depth-selective conversion-electron M...

W. A. A. Macedo, D. Pelloth, T. Toriyama, O. Nikolov, S. Kruijer… in Hyperfine Interactions (1994)

Article

Local magnetic properties of ultrathin ferromagnetic fcc-Fe-films on Cu(001)

Conversion electron Mössbayer spectroscopy (CEMS) on three monolayers (ML) thick metastable fcc-Fe(001) films grown epitaxially on a Cu(001) substrate under different conditions shows that these films are char...

A. Fuest, R. D. Ellerbrock, A. Schatz, W. Keune, R. A. Brand… in Hyperfine Interactions (1994)

Article

EFG studies of the AlCuFe quasicrystal and related structures

It is known that the structure and thermal stability of the AlCuFe icosahedral quasicrystalline (i-QC) phase is extremely sensitive to the exact composition. A stable, ideally quasiperiodic phase exists only a...

R. A. Brand, J. Pelloth, F. Hippert, Y. Calvayrac in Hyperfine Interactions (1994)