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Articles 61  77 of 77
FullText Articles in Physics
Density Of Zeros On The LeeYang Circle Obtained From Magnetization Data Of A TwoDimensional Ising Ferromagnet, Christian Binek
Density Of Zeros On The LeeYang Circle Obtained From Magnetization Data Of A TwoDimensional Ising Ferromagnet, Christian Binek
Christian Binek Publications
In order to provide experimental access to the statistical theory of Lee and Yang [Phys. Rev. 87, 410 (1952)] the density function g(θ) of zeros on the LeeYang circle has been determined for the first time by analyzing isothermal magnetization data m(H) of the Ising ferromagnet FeCl_{2} in axial magnetic fields H at temperatures 34≤T≤99 K. The validity of our approach is demonstrated by the perfect agreement of magnetic specific heat data as calculated from g(θ) and m(H) via Maxwell's relation. Moreover, the correct inplane exchange constant of FeCl_{2} emerges from ...
Polydispersivity Of NonCritical FieldInduced Fluctuations In Febr2, Christian Binek
Polydispersivity Of NonCritical FieldInduced Fluctuations In Febr2, Christian Binek
Christian Binek Publications
The field and temperature dependence of the complex lowfrequency susceptibility of the metamagnet FeBr2 exhibits large anomalies in the vicinity of the secondorder phase boundary Hc(T). The lowfrequency losses reflect polydispersive dynamics with a broad distribution of relaxation times peaking at τ ≈ 0.2 s. The dispersion, χ versus ƒ, is well described within Chamberlin's model of dynamically coupled domains. The heterogeneous glasslike response gives rise to the intuitive picture of a magnetic fluid of high viscosity.
FieldInduced Transverse Spin Ordering In Febr_{2}, O. Petracie, Christian Binek, Wolfgang Kleemann, U. Neuhausen, H. Lueken
FieldInduced Transverse Spin Ordering In Febr2, O. Petracie, Christian Binek, Wolfgang Kleemann, U. Neuhausen, H. Lueken
Christian Binek Publications
Weak firstorder phase transitions from axial to oblique spin ordering in FeBr2 are evidenced by superconducting quantum interference device magnetometry in axial fields H_{1}(T) above the multicritical point, H_{m}=2.4 MA/m, T_{m}=4.6 K, and below the antiferrotoparamagnetic phase line, H_{c} (T), in agreement with recent specificheat data [H. Aruga Katori, K. Katsumata, and M. Katori, Phys. Rev. B 54, R9620 (1996)]. The ordering of the inplane moments is probably due to nondiagonal coupling to the longitudinal ones, both of which increase discontinuously at H_{1} (T) only under an additional symmetrybreaking ...
Crossover From Pure Ising To RandomExchange Dominated Behavior Of The TwoDimensional Antiferromagnet Rb_{2}Co_{1X}Mg_{X}F_{4}, Christian Binek, Wolfgang Kleemann, David P. Belanger
Crossover From Pure Ising To RandomExchange Dominated Behavior Of The TwoDimensional Antiferromagnet Rb2Co1XMgXF4, Christian Binek, Wolfgang Kleemann, David P. Belanger
Christian Binek Publications
The temperature dependence of the uniform susceptibility χ of diluted twodimensional Ising antiferromagnets Rb_{2}Co_{1x}Mg_{x}F_{4}, 0<~xN(x), but also in relation to the “local” phase transition temperatures TN′ throughout the Griffiths regime, T_{N}(x)<~T_{N}′<~T_{N}(0), a satisfactory quantitative description of χ vs T is deduced for any x above the percolation threshold. ©1998 The American Physical Society
Kinetics Of RandomField Induced Domains In The TwoDimensional Ising Antiferromagnet Rb2co0.85mg0.15f4, Christian Binek
Kinetics Of RandomField Induced Domains In The TwoDimensional Ising Antiferromagnet Rb2co0.85mg0.15f4, Christian Binek
Christian Binek Publications
The previous kinetics of the twodimensional diluted Ising antiferromagnet Rb2Co0.85Mg0.15F4 is studied via the temporal relaxation of the fieldinduced magnetization after field cooling (FC) and zerofield cooling (ZFC), respectively, to T < TN = 75.2K. After FC different nonexponential decay laws indicate a crossover from domain reorientation to wall rearrangement at decreasing T. After ZFC rapidly saturating magnetization of naturally grown domain walls precedes the slow randomfieldcontrolled disordering process.
Metamagnetic Domains And Dynamic Fluctuations In Febr_{2}, O. Petracic, Christian Binek, Wolfgang Kleeman
Metamagnetic Domains And Dynamic Fluctuations In Febr2, O. Petracic, Christian Binek, Wolfgang Kleeman
Christian Binek Publications
The mixed phase and the regime of noncritical fluctuations of the magnetic phase diagram of FeBr_{2} is investigated by SQUID susceptometry and light diffraction techniques. The experiments seem to evidence instability of the tricritical point as conjectured recently. The observation of stripe domains and light diffraction below and above T_{m} = 4.6 K and the virtual continuation of the phase transition line to above T_{m} are in agreement with the occurrence of a critical endpoint at T_{m} and of a bicritical endpoint at T > T_{m}. ©1997 American Institute of Physics.
Neutron Scattering Study Of Transverse Magnetism, Christian Binek, T. Kato, Wolfgang Kleemann, O. Petracic, D. Bertrand, F. Bourdarot, P. Burlet, H. Aruga Katori, K. Katsumata, K. Prokes, S. Welzel
Neutron Scattering Study Of Transverse Magnetism, Christian Binek, T. Kato, Wolfgang Kleemann, O. Petracic, D. Bertrand, F. Bourdarot, P. Burlet, H. Aruga Katori, K. Katsumata, K. Prokes, S. Welzel
Christian Binek Publications
In order to clarify the nature of the additional phase transition at H_{1} (T) < H_{c} (T) of the layered antiferromagnetic (AF) insulator FeBr_{2} as found by Aruga Katori et al. (1996) we measured the intensity of different Braggpeaks in different scattering geometries. Transverse AF ordering is observed in both AF phases, AFI and AFII. Its order parameter exhibits a peak at T_{1} = T (H_{1}) in temperature scans and does not vanish in zero field. Possible origins of the steplike increase of the transverse ferromagnetic ordering induced by a weak inplane field component when entering AFI ...
Magnetic NeutronScattering Investigation Of The FieldInduced Griffiths Phase In Fecl_{2}, Christian Binek, D. Bertrand, L.P. Regnault, Wolfgang Kleemann
Magnetic NeutronScattering Investigation Of The FieldInduced Griffiths Phase In Fecl2, Christian Binek, D. Bertrand, L.P. Regnault, Wolfgang Kleemann
Christian Binek Publications
Quasielastic neutron scattering has been utilized to investigate the Griffiths phase induced by an axial magnetic field in FeCl_{2} at temperatures T_{c}(H)⩽T⩽T_{N}, where T_{c}(H) is the transition temperature in an external magnetic field H. We present the temperature dependence of the integrated neutronscattering intensity at fixed scattering vectors for various magnetic fields. On cooling below T_{N} the antiferromagnetic shortrange fluctuations decrease due to an increase of the volume fraction which is already antiferromagnetically ordered. A weighted average of the local contributions to the antiferromagnetic susceptibility quantitatively describes the scattering cross section.
Local Magnetic Properties Of Antiferromagnetic Febr_{2}, J. Pelloth, R.A. Brand, S. Takele, M.M. Pereira De Azevedo, Wolfman Kleemann, Christian Binek, J. Kushauer, D. Bertrand
Local Magnetic Properties Of Antiferromagnetic Febr2, J. Pelloth, R.A. Brand, S. Takele, M.M. Pereira De Azevedo, Wolfman Kleemann, Christian Binek, J. Kushauer, D. Bertrand
Christian Binek Publications
The antiferromagnet FeBr_{2} has been studied by Mössbauer spectroscopy in external fields both in the metamagnetic region below the multicritical temperature T_{MCP} and in the secondorder transition region above. The local magnetization shows that the metamagnetic transition occurs by spin flips, as in simple models. However, in the secondorder transition region, the local magnetization of the sublattice oriented antiparallel to the external field varies continuously but remains parallel to the c axis. This can only be understood if the external magnetic field induces strong transversal spin precession of the moments on the antiparallel sublattice. This shows that the ...
MagneticFieldInduced Griffiths Phase Versus RandomField Criticality And Domain Wall Susceptibility Of Fe0.47zn0.53f2, Christian Binek, S. Kuttler, Wolfgang Kleemann
MagneticFieldInduced Griffiths Phase Versus RandomField Criticality And Domain Wall Susceptibility Of Fe0.47zn0.53f2, Christian Binek, S. Kuttler, Wolfgang Kleemann
Christian Binek Publications
The wellknown peak of the parallel ac susceptibility arising below TN in Fe_{0.47}Zn_{0.53}F_{2} splits into a narrow critical peak at T_{c} (H) and a broad fieldinduced Griffiths phase shoulder peaking at T_{p}>T_{c}(H) in magnetic fields H≳1.6 MA /m. Randomfield (RF) criticality with α̃≈0 and subsequent rounding due to RF trapping of thermal fluctuations are observed upon zerofield cooling as T→T_{c}(H). The frozen domain state obtained after rapid field cooling reveals excess susceptibility Δχw′∝H^{2.6}, owing to rough walls with thermally ...
Evidence Of DilutionInduced Griffiths Instabilities In K_{2}Cu_{1X}Zn_{X}F_{4} And Fe_{1X}Zn_{X}F_{2}, Christian Binek, Wolfgang Kleeman
Evidence Of DilutionInduced Griffiths Instabilities In K2Cu1XZnXF4 And Fe1XZnXF2, Christian Binek, Wolfgang Kleeman
Christian Binek Publications
Weak quasistatic singularities are evidenced within the Griffiths regime of temperatures T_{c}(x)≤T≤T_{c}(x=0) in the diluted antiferromagnet Fe_{1x}Zn_{x}F_{2}, x=0.53, and in the diluted ferromagnet K_{2}Cu_{1x}Zn_{x}F_{4}, x=0.2, by measurements of the magnetic susceptibility, χ’ vs T, in zero external field. Significant deviations from classical (γ=1, for Fe_{0.47}Zn_{0.53}F_{2}) and nonclassical (γ≳1, for K_{2}Cu_{0.8}Zn_{0.2}F_{4}) CurieWeisstype behavior, χ’∝[TT_{c}(x)] ^{Y}, are found ...
Interface Alloying And Magnetic Properties Of Fe/Rh Multilayers, K. Hanisch, W. Keune, R.A. Brand, Christian Binek, Wolfman Kleemann
Interface Alloying And Magnetic Properties Of Fe/Rh Multilayers, K. Hanisch, W. Keune, R.A. Brand, Christian Binek, Wolfman Kleemann
Christian Binek Publications
Rh(20 Å)/^{57}Fe(t_{Fe}) multilayers with Fe thicknesses t_{Fe} of 2, 5, 10, and 15 Å prepared by alternate evaporation in UHV have been investigated by xray diffraction (XRD), Mössbauer spectroscopy, and SQUID magnetometry. First and secondorder superstructure Bragg peaks (but no higherorder peaks) in smallangle XRD patterns suggest some compositional modulation. Mössbauer spectra taken at 4.2 K are characterized by a distribution P(B_{hf}) of hyperfine fields B_{hf}. Peaks observed in the P(B_{hf}) curves near 17 and 35 T are assigned to an fccRhFe interface alloy (~7–24 at. % Fe ...
Blocking Of Logarithmic Temporal Relaxation Of Magnetic Remanence By Piezomagnetically Induced Domains In Fe_{1X}Zn_{X}F_{2}, J. Kushauer, Christian Binek, Wolfgang Kleemann
Blocking Of Logarithmic Temporal Relaxation Of Magnetic Remanence By Piezomagnetically Induced Domains In Fe1XZnXF2, J. Kushauer, Christian Binek, Wolfgang Kleemann
Christian Binek Publications
Faraday rotation and superconducting quantum interference device magnetometry were used to investigate the relaxation of the weakfield induced remanence, µ, of the randomfield Ising model system Fe_{1x}Zn_{x}F_{2}. The stretched logarithmic decay law, as predicted by Nattermann and Vilfan for the case of compact domains with fractal surfaces, was confirmed for freezing fields of 3≤B≤5 T. Virtually constant remanence, µ, was found at low fields, 0.0002≤B≤1.5 T. This ferrimagnetic moment is due to the piezomagnetic effect acting on randomstress induced immobile domains. Chemical etching, which removes surface stress originating from ...
Domainlike Antiferromagnetic Correlations Of Paramagnetic Fecl_{2}: A FieldInduced Griffiths Phase?, Christian Binek, Wolfgang Kleemann
Domainlike Antiferromagnetic Correlations Of Paramagnetic Fecl2: A FieldInduced Griffiths Phase?, Christian Binek, Wolfgang Kleemann
Christian Binek Publications
Domainlike antiferromagnetic correlations are detected by SQUID measurements of the lowfrequency susceptibility in the metamagnet FeCl_{2} when exposed to an axial magnetic field H at temperatures T_{c} (H)≤T≤T_{N}. A distinct change of curvature of χ’’ vs T appearing at T_{N} is explained in terms of fluctuating distributions of demagnetizing fields and, hence, transition temperatures. The fieldinduced dynamic domain phase—an analog of the Griffiths phase predicted for a ferromagnet with dilution x within T_{c}(x)≤T≤T_{c}(0)—is confirmed by elastic light scattering experiments.
RandomField Critical And SpinFlop Behavior Of The Anisotropic Heisenberg Antiferromagnet Fe0.9mg0.1br2 In Axial Magnetic Fields, Christian Binek
RandomField Critical And SpinFlop Behavior Of The Anisotropic Heisenberg Antiferromagnet Fe0.9mg0.1br2 In Axial Magnetic Fields, Christian Binek
Christian Binek Publications
Faraday optical measurements on the dilute hexagonal antiferromagnet Fe0.85Mg0.15Br2 in an external axial field reveal a spinflop phase line ending at a multicritical point (Tm=8.1 K, Hm=1050 kA m1) and crossover from randomexchange to randomfield Ising criticality with an exponent Phi =1.40+or0.04 in the vicinity of TN=11.1 K. Cusplike behaviour of the specific heat at TN is discussed in view of recent Monte Carlo results.
Light Diffraction By FieldInduced NonPeriodic Magnetic Domain Structures In Fecl2, Christian Binek
Light Diffraction By FieldInduced NonPeriodic Magnetic Domain Structures In Fecl2, Christian Binek
Christian Binek Publications
The magneticfieldinduced mixed phase of the meta magnet FeCl2 gives rise to reduced transmittivity of circularly polarized light. Within the framework of the diffraction theory of thin random magnetic phase gratings and the assumption of fielddependent refractive indices of the antiferromagnetic domains the field dependence of the transmission is perfectly modeled.
The Effect Of Diamagnetic Dilution On The SpinPhonon Interaction And Scattering Cross Section In Fe1Xznxf2, Christian Binek
The Effect Of Diamagnetic Dilution On The SpinPhonon Interaction And Scattering Cross Section In Fe1Xznxf2, Christian Binek
Christian Binek Publications
The temperature dependences of the first moments of phonon Raman scattering lines are studied for Fe1xZnxF2. The diamagnetic dilution diminishes the spinphonon coupling strength of phonons with both A1g and Eg symmetry in proportion to the decrease in the ordering temperature TN. Moreover, the Eg mode shows an asymmetrical lineshape for Zn concentrations x>0.3. It is explained by an unresolved superposition of two modes, one of which is ascribed to perturbed ZnF2 with broken translational symmetry.