نتایج جستجو برای: ferromagnetism
تعداد نتایج: 3261 فیلتر نتایج به سال:
We report that the ferromagnetism of highly ordered pyrolytic graphite (HOPG) samples as measured by hysteretic magnetization loops can be diminished and eventually extinguished with sufficiently long high vacuum anneals at temperatures on the order of 2300 !C. Concomitant with the extinction of ferromagnetism, we observe an annealinduced increase in grain size (accompanied by possible edge rec...
Diamagnetic oxides can, under certain conditions, become ferromagnetic at room temperature and therefore are promising candidates for future material in spintronic devices. Contrary to early predictions, doping ZnO with uniformly distributed magnetic ions is not essential to obtain ferromagnetic samples. Instead, the nanostructure seems to play the key role, as room temperature ferromagnetism w...
Crystals with full tetrahedral symmetry may exhibit antichiral ferromagnetic ordering. This spontaneous modulation of the magnetization direction is characterized by a spatial alternation between right and left handedness. In addition to unconventional ground state, revealed ordering gives rise rich phenomena, such as unique magnetic domains skyrmions.
Submitted for the MAR09 Meeting of The American Physical Society Development of ferromagnetism in Pd nanoparticles with reduction in size MOHINDAR SEEHRA, JAMES RALL, West Virginia University, J. LIU, C. ROBERTS, Auburn University — Bulk fcc Pd is a paramagnet just missing the Stoner criterion for ferromagnetism (N(EF )I > 1) [1]. Several groups have reported weak ferromagnetism in 2-4 nm Pd na...
Two-dimensional nanostructures with controllable magnetic and electronic properties are desirable for their versatile applications in quantum devices. Here, we present a first-principles design on their magnetic and electronic switching controlled by tension. We find that hydrogenated VTe2 monolayer experiences a transfer from anti-ferromagnetism to ferromagnetism via a turning-point of paramag...
Ferromagnetism and its evolution in the orthorhombic perovskite system Sr(1-x)Ca(x)RuO3 have been widely believed to correlate with structural distortion. The recent development of high-pressure synthesis of the Ba-substituted Sr(1-y)Ba(y)RuO3 makes it possible to study ferromagnetism over a broader phase diagram, which includes the orthorhombic Imma and the cubic phases. However, the chemical ...
Ferromagnetism was observed in a Pt(100) ultrathin film deposited on SrTiO3(100) substrate. The ferromagnetism, which appears films with thicknesses of 2.2–4.4 nm, periodically changes period approximately 1 nm (5–6 monolayers) depending the thickness. This is consistent derived from quantum-well states formed thin film. X-ray magnetic circular dichroism measurements show evidence appearance in...
NOVEMBER 2008 | VOLUME 11 | NUMBER 11 13 The physics of high-temperature cuprate superconductors in the overdoped regime, where superconductivity is suppressed, is something of a mystery. But first-principle calculations by researchers in the US and Switzerland appear to confirm a recent suggestion that ferromagnetism can destroy superconductivity at high doping levels [B. Barbiellini and T. Ja...
We have investigated Sr1−xLax/2Kx/2RuO3 and Sr1−xPbxRuO3, which have a larger average size of the A-site cations. They manifest a gradual loss of ferromagnetism in a similar way as their counterparts with smaller Asite cations. There is also evidence for a magnetism-suppressing disorder effect similar to that observed in Sr1−xLax/2Nax/2RuO3. Therefore, the Stoner ferromagnetism in SrRuO3 is rat...
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