Microstructural effects on the magnetic behavior of rf-sputtered CoFe–AgCu granular alloys are examined through the study of the in-plane remanence-to-saturation magnetization ratio, M r /M s , as a function of temperature, ferromagnetic volume content, xv , and annealing temperature. At low ferromagnetic contents (xv<0.25), the M rM s ratio in as-deposited samples tends towards 0.5 at low temp...

Introduction. The extraction of directed motion from random fluctuations is an old and controversial problem in statistical mechanics with a long and interesting history [1]. Although excluded by the second law of thermodynamics for equilibrium systems, rectification of fluctuations is possible in systems driven sufficiently far away from thermal equilibrium [2, 3]. The problem has gained renew...

Magnetic resonance imaging is an important technique for identifying different types of tissues in a body or spatial information about composite materials. Because temperature is a fundamental parameter reflecting the biological status of the body and individual tissues, it would be helpful to have temperature maps superimposed on spatial maps. Here we show that small ferromagnetic particles wi...

A systematic study of the spin configuration of ferromagnetic(core)/antiferromagnetic(shell) nanocomposite particles was carried out by two approaches: micromagnetic and atomistic simulations. In the case of strong interlayer exchange coupling between ferromagnet and antiferromagnet, the micromagnetic simulation result is consistent with the atomistic simulation result. However, in the case of ...