The sweep rate dependence of the electrical control of magnetic coercivity" (2012). Stephen Ducharme Publications. 84. The sweep rate dependence of the coercive field in magnetic thin films is well-known. Here we present an experimental investigation of the dependence of electric field control of magnetization on the magnetic field sweep rate. Our sample is a ferroelectric/ferromagnetic heteros...

We study connections between four different types of results that are concerned with vector-valued functions u : Ω → R of class L(Ω) on a domain Ω ⊂ R: Coercivity results in H(Ω) relying on div and curl, the Helmholtz decomposition, the construction of vector potentials, and the global div-curl lemma. Key-words: Friedrichs inquality, coercivity, div-curl lemma, compensated compactness

Abstract. Some criteria for the asymptotic stability of nonlinear stochastic partial differential equations with variable delays are presented. A coercivity condition plays the role of an exponential stability criterion. Consequently, under the coercivity condition almost all the trajectories of the nonstationary solutions of the given stochastic system finally tend exponentially to zero. Two e...

Standard approaches to investigate the anisotropy of nanoparticle assemblies are either by means zero-field-cooled–field-cooled DC magnetization curves or analyzing coercivity at low temperatures. However, these methodologies restricted average values an constant, without probing its temperature dependence symmetry. In this context, thermal arises as a more comprehensive approach assess anisotr...

This article reports on the magnetic properties of interacting uncoated nickel ferrite (NiFe2O4) nanoparticles synthesized through an aerosol levitation-jet technique. A comprehensive set of samples with different compositions of background gas and metal precursors, as well as applied electric field intensities, has been studied. Nanoparticles prepared under a field of 210 kV m(-1) show moderat...

High-resolution records of the upper Olduvai geomagnetic field reversal were obtained from two localities within steeply dipping lacustrine sediments of the Confidence Hills, southern Death Valley, California . The difference in bedding attitude between the two localities allowed us to perform a fold test of both transitional and non-transitional paleomagnetic directions. This is the first posi...

The Kronmüller formula is used to qualitatively explain the coercivity of permanent magnets. Such simple expressions are useful for understanding elements that influence coercivity. This study attempts derive within framework Ginzburg-Landau theory. results revealed magnetic material was defined by slope free energy landscape. reduction parameter α anisotropy field Hk in depends on functional f...

Polarized neutron reflectivity (PNR) is used to obtain the magnetic depth profile of an antiferromagnetically coupled ferrimagnetic/ferrimagnetic bilayer, Gd40Fe60/Tb12Fe88. This system shows a transition from positive to negative exchange bias field H(E) as the cooling field H(cf) is increased from small to large positive value. It also exhibits training behavior upon field cycling which affec...

Domain wall mobility as a function of nonmagnetic interlayer thickness and temperature was studied in ultrathin exchange-coupled ferromagnetic layers using magneto-optic Kerr microscopy. The system under study is Pt/Co/Pt/Co/Pt heterostructure having perpendicular magnetic anisotropy middle Pt layer with spatially variable thickness. interaction between the Co observed when varies from 5 to 6 n...