نتایج جستجو برای: soft ferromagnetism

تعداد نتایج: 128569  

Journal: :international journal of nanoscience and nanotechnology 2015
a. dahmardeh a. m. davarpanah

using fe(no3)3.9h2o, co(no3)2.6h2o and mn(no3)2.4h2o the magnetic properties of nanoparticles trimetalic iron - cobalt - manganese, with supported magnesium oxide have been prepared by co-precipitation and solvothermal methods. the prepared samples are characterized by scanning electron microscope (sem), x-ray diffraction (xrd), vibrating sample magnetometer (vsm) and brunaer-emmett-teller (bet...

Amirabadizadeh, Ahmad, Hassanzadeh , Moazemeh, Rasouli, MohammadReza, Sarhadi, Reza,

In this study, for the first time, cobalt base ribbons were made by adding two different amounts of tungsten with Co67.7Fe4W0.8Si16.5B11 and Co66.5Fe4W2 Si16.5B11 compounds by melt spinning in the water. The pattern of  X-ray diffraction taken from these ribbons shows that these magnetic ribbons are amorphous. By using thermal analysis curves, taken from the ribbons, crystallization temperature...

A. Dahmardeh A. M. Davarpanah

Using Fe(NO3)3.9H2O, Co(NO3)2.6H2O and Mn(NO3)2.4H2O the magnetic properties of nanoparticles trimetalic Iron - Cobalt - Manganese, with supported Magnesium oxide have been prepared by Co-precipitation and Solvothermal methods. The prepared samples are characterized by Scanning Electron Micros...

Journal: :European Journal of Inorganic Chemistry 2021

We have studied the magnetic properties of various Boron particles obtained by different methods and found evidence soft ferromagnetism in all. While our study cannot unequivocally exclude that is at origin magnetism, we suggest impurities which are either result synthetic process or come from intentional doping indeed responsible for observed properties. The phenomenon bears similarities with ...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2000
R B Laughlin D Pines J Schmalian B P Stojkovic P Wolynes

Mesoscopic organization in soft, hard, and biological matter is examined in the context of our present understanding of the principles responsible for emergent organized behavior (crystallinity, ferromagnetism, superconductivity, etc.) at long wavelengths in very large aggregations of particles. Particular attention is paid to the possibility that as-yet-undiscovered organizing principles might...

Journal: :Physical review letters 1995
Tasaki

We present the first rigorous examples of non-singular Hubbard models which exhibit ferromagnetism at zero temperature. The models are defined in arbitrary dimensions, and are characterized by finite-ranged hoppings, dispersive bands, and finite on-site Coulomb interaction U . The picture, which goes back to Heisenberg, that sufficiently large Coulomb interaction can revert Pauli paramagnetism ...

2007
C. Paduani A. Migliavacca

Co2+x+yMn1−xAl1−y intermetallic compounds have been prepared by arc melting and studied with X-ray diffraction and magnetization measurements to ascertain the effect of deviations of composition from the stoichiometry on the ferromagnetism of this system. Hysteresis loops registered at room temperature show a soft ferromagnetic behavior in excess Co. In off-stoichiometric alloys the saturation ...

2007
HaeJin Kim JinBae Lee Young-Min Kim Myung-Hwa Jung Z Jagličić P Umek J Dolinšek

We present synthesis, structure and magnetic properties of structurally well-ordered single-crystalline b-MnO2 nanorods of 50–100 nm diameter and several lm length. Thorough structural characterization shows that the basic b-MnO2 material is covered by a thin surface layer (~2.5 nm) of a-Mn2O3 phase with a reduced Mn valence that adds its own magnetic signal to the total magnetization of the b-...

Journal: :Physical review letters 2012
S Nishimoto Y Ohta

We study the effects of opening the band gap on the double exchange ferromagnetism. Applying the density-matrix renormalization group method and an analytical expansion from the dimer limit to the one-dimensional double exchange model, we demonstrate for a relevant region of the exchange coupling that, in the weak dimerization regime, the Peierls gap opens in the fully spin-polarized conduction...

Journal: :Nano letters 2009
Yan Wang Yi Huang You Song Xiaoyan Zhang Yanfeng Ma Jiajie Liang Yongsheng Chen

Aiming at molecular-based magnets, ferromagnetism of pure carbon-based materials is fundamentally and technologically extremely important for many applications. While it is still not fully understood, many recent theoretical works have suggested that one-atom-thick two-dimensional graphene materials may show ferromagnetism due to the existence of various defects or topological structures as the...

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