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Concept

Paléomagnétisme

Publications associées (28)

Magnetization reversal in individual Py and CoFeB nanotubes locally probed via anisotropic magnetoresistance and anomalous Nernst effect

Anna Fontcuberta i Morral, Dirk Grundler

Using anisotropic magnetoresistance in a multi-probe configuration and local heating with a scanning laser, we investigate the magnetization reversal of individual permalloy (Py) and CoFeB nanotubes with spatial resolution. Nanocrystalline Py and amorphous ...

AIP American Institute of Physics2016

Simultaneous electronic and the magnetic excitation of a ferromagnet by intense THz pulses

Christoph Peter Hauri

The speed of magnetization reversal is a key feature in magnetic data storage. Magnetic fields from intense THz pulses have been recently shown to induce small magnetization dynamics in a cobalt thin film on the sub-picosecond time scale. Here, we show tha ...

Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2016

Cold pulse and rotation reversals with turbulence spreading and residual stress

Ning Yan

Transport modeling based on inclusion of turbulence spreading and residual stresses shows internal rotation reversals and polarity reversal of cold pulses, with a clear indication of nonlocal transport effects due to fast spreading in the turbulence intens ...

American Institute of Physics (AIP)2016

MnO nanoparticles as the cause of ferromagnetism in bulk dilute Mn-doped ZnO

Henrik Moodysson Rønnow, Arnaud Magrez, Diane Virginie Marie Lançon, Ping Huang

We show that the observed ferromagnetic behavior of ZnO lightly doped with Mn coincides with the presence of MnO nanoparticles, whereas cluster-free Mn doped ZnO behaves paramagnetically. This conclusion is reached by a study of the structural and magnetic ...

2016

Neel-like domain walls in ferroelectric Pb(Zr,Ti)O-3 single crystals

Nava Setter, Tomas Sluka

In contrast to the flexible rotation of magnetization direction in ferromagnets, the spontaneous polarization in ferroelectric materials is highly confined along the symmetry-allowed directions. Accordingly, chirality at ferroelectric domain walls was trea ...

Nature Publishing Group2016

Magnetization reversal of an individual exchange-biased permalloy nanotube

Anna Fontcuberta i Morral, Dirk Grundler, Gözde Tütüncüoglu, Federico Matteini

We investigate the magnetization reversal mechanism in an individual permalloy (Py) nanotube (NT) using a hybrid magnetometer consisting of a nanometer-scale SQUID (nanoSQUID) and a cantilever torque sensor. The Py NT is affixed to the tip of a Si cantilev ...

American Physical Society2015

Spin-stripe phase in a frustrated zigzag spin-1/2 chain

Helmuth Berger

Motifs of periodic modulations are encountered in a variety of natural systems, where at least two rival states are present. In strongly correlated electron systems, such behaviour has typically been associated with competition between short-and long-range ...

Nature Publishing Group2015

Magnetoelectric effects in the skyrmion host material Cu2OSeO3

Helmuth Berger

Insulating helimagnetic Cu2OSeO3 shows sizeable magnetoelectric effects in its skyrmion phase. Using magnetization measurements, magneto-current analysis and dielectric spectroscopy, we provide a thorough investigation of magnetoelectric coupling, polariza ...

Nature Publishing Group2015