Concept

Paléomagnétisme

Publications associées (95)

Exploitation of iron-BH local hysteresis for the rotor position detection of a PM motor

Yves Perriard, Miroslav Markovic, Omar Scaglione

In this paper it is shown that the phase self inductance and resistance, both measured at a high frequency, of a permanent magnet (PM) motor with non-salient rotor vary slightly with the rotor position. The origin of these variations is deeply inve ...

2009

Exploitation of iron B-H local hysteresis for the rotor position detection of a PM motor

Yves Perriard, Miroslav Markovic, Omar Scaglione

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2009

Upper critical fields well above 100 T for the superconductor SmFeAsO0.85F0.15 with T-c=46 K

Marco Cantoni

We report specific-heat measurements at magnetic fields up to 20 T on the recently discovered superconductor SmFeAsO0.85F0.15. The B-T diagram of a polycrystalline SmFeAsO0.85F0.15 sample with T-c=46 K was investigated. The temperature dependence of B-c2 w ...

2008

Shock-induced metallic iron nanoparticles in olivine-rich Martian meteorites

Philippe Gillet, Pierre Beck

Magnetic anomalies observed by the Mars Global Surveyor mission are attributed to crustal remanence. SNC (Shergotty-Nakhla-Chassigny) meteorites are likely samples of the Martian crust and are amenable to mineralogical and magnetic measurements essential t ...

2007

Microscopic theory for the Markovian decay of magnetization fluctuations in nanomagnets

Ioannis Rousochatzakis

We present a microscopic theory for the phonon-driven decay of the magnetization fluctuations in a wide class of nanomagnets where the dominant energy is set by isotropic exchange and/or uniaxial anisotropy. Based on the Zwanzig-Mori projection formalism, ...

2007

Magnetic structure of the S=1Ni(5)(TeO3)(4)Br-2 layered system governed by magnetic anisotropy

Helmuth Berger

Magnetization, neutron diffraction, and antiferromagnetic resonance measurements were employed to investigate the magnetic ground state of Ni-5(TeO3)(4)Br-2 single crystal. Despite the layered topology of the Ni2+ sites, typical for frustrated antiferromag ...

2007

Magnetism induced by single-atom defects in nanographites

Lothar Helm, Oleg Yazyev

We study from first principles the magnetism in graphene induced by single carbon atom defects. For two types of defects considered in our study, the hydrogen chemisorption defect and the vacancy defect, the magnetism due to the defect-induced extended sta ...

2007

A low-dimensional iron(II) phosphate exhibiting field-dependent magnetization steps

Wendy Lee Queen, Lei Wang

Large single crystals of the new magnetic solid RbNa3Fe7(PO4)6 can be grown in a salt flux. Below the ferro-to-antiferromagnetic transition temp. of 6 K, the field (H) dependence of the magnetization (M) of an oriented crystal of exhibits equally spaced st ...

2007

Permalloy thin films exchange coupled to arrays of cobalt islands

Jürgen Brugger, Marc Antonius Friedrich van den Boogaart

Periodic arrays of elongated cobalt islands exchange coupled to continuous Permalloy thin films were fabricated using silicon nitride stencil masks and the magnetic spin configurations during magnetization reversal were studied with photoemission electron ...

2006

Evidence of high dissipation in magnetization reversal processes of five Co/Cu bilayers

Jean-Philippe Ansermet, Santiago Serrano Guisan

Heat and charge transport perpendicular to the plan in five Co/Cu stacks are studied using AC temperature gradients in the presence of a DC current. Large peaks in AC voltage response versus applied field are observed. This effect, measured only in reversi ...

Elsevier2006

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