We have measured the dc magnetization at low temperatures of tetragonal crystals of Mn12 acetate complex @Mn12O12~CH3COO!16~H2O!4#, a material composed of a large ~Avogadro’s! number of identical magnetic molecules, each of spin 10. Exchange coupling between Mn ions within each molecule is very strong, while the interaction between molecules is negligible. A large, uniaxial anisotropy ~;60 K! g...

Mtissbauer measurement, chemical analysis (ratioof Fez+ to total Fe content), analyses ofthe rotational hysteresis loss (Wr) and the magnetic viscosity coefficient (Sv) for bacterial magnetic particles covered with organic thin films (BMPs) were investigated and compared with the results for Fes04 h e particles prepared by a chemical coprecipitation method. The calculated value of the saturatio...

The influence that dipole-dipole interactions exert on the dynamics of the magnetization of nanometer-sized Co clusters has been studied by means of ac and dc susceptibility experiments. These clusters grow in a quasiordered layered structure, where all relevant parameters can be tailored and measured independently. Our data show without ambiguity that the magnetic relaxation becomes slower as ...

We report dc-magnetization measurements on YbRh2Si2 at temperatures down to 0.04 K, magnetic fields B< or =11.5 T, and under hydrostatic pressure P< or =1.3 GPa. At ambient pressure a kink at B* =9.9 T indicates a new type of field-induced transition from an itinerant to a localized 4f state. This transition is different from the metamagnetic transition observed in other heavy-fermion compounds...

The magnetic properties of Ho2Fe17 − xMnx compounds (x = 0–2) of ferromagnetic ordering temperatures up to TC ~344 K have been investigated by DC magnetization and Mössbauer effect measurements. The nature of the magnetic phase transitions and the critical behaviour around TC has been investigated by analysis of the magnetisation data and the critical exponents β, γ and δ determined. The critic...

The effect of Zr-substitution on the physical and magnetic properties of Li0.3+0.5xZn0.4ZrxFe2.3-1.5xO4 ferrites (x=0.0, 0.01, 0.02, 0.03 and 0.05), prepared by the standard ceramic method, has been studied. It is found that the saturation magnetization increases up to x=0.02 and then it decreases. On the other hand, the initial permeability increased while the Curie temperature remained almost...

Charged skyrmions or spin–textures in the quantum Hall ferromagnet at filling factor ν = 1 are reinvestigated using the Hartree–Fock method in the lowest Landau level approximation. It is shown that the single Slater determinant with the minimum energy in the unit charge sector is always of the hedgehog form. It is observed that the magnetization vector’s length deviates locally from unity, i.e...

In this study, samples with nominal composition of Bi2Sr2Ca1Cu2-xYbxOy, where x = 0.0, 0.05, 0.1 and 0.25 have been textured using the Laser Floating Zone technique. The effects of different Yb doping on the structure have been investigated by electrical resistivity, scanning electron microscopy, XRD, mechanical and dc-magnetization techniques. It has been found that with increasing Yb doping f...

HC n=32 MDD n=30 DC n=18 DD n=15 Age mean(SD) 55.13 (16.28) 54.90 (13.67) 56.11 (11.06) 54.27 (8.32) F=0.06 p=0.98 Gender (M/F) 16/16 14/16 9/9 6/9 ?2=0.47 p=0.93 Magnetization Transfer Imaging Reveals Subcortical Biophysical Abnormalities in Patients with Type 2 Diabetes and Major Depression Shaolin Yang, Olusola Ajilore, Minjie Wu, Melissa Lamar, and Anand Kumar Department of Psychiatry, Univ...

We use a phase-sensitive, quantitative technique to separate inductive and ac inverse spin Hall effect (ISHE) voltages observed in Ni(81)Fe(19)/normal metal multilayers under the condition of ferromagnetic resonance. For Ni(81)Fe(19)/Pt thin film bilayers and at microwave frequencies from 7 to 20 GHz, we observe an ac ISHE magnitude that is much larger than that expected from the dc spin Hall a...