An understanding of spin excitations in cuprates is essential since the mechanism of high-T(C) superconductivity might be linked to spin fluctuations. Band calculations for 'one-dimensional' unit cells of La(2)CuO(4) show larger coupling (spin-phonon coupling, SPC) between anti-ferromagnetic spin waves and O-phonons than for Cu- or La-phonons. When this result is applied to a two-dimensional, f...

this paper provides an overview of how the surface properties of ferromagnetic nanoparticles dispersed in fluids is modified by natural and biocompatible polymers. among common magnetic nanoparticles, magnetite (fe3o4) and maghemite (g-fe203) are popular candidates because of their biocompatibility. natural polymeric coating materials are the most commonly used biocompatible magnetic nanopartic...

Phase diagrams of the two-dimensional one-band t-t ′ Hubbard model are obtained within the two-patch and the temperature-cutoff many-patch renor-malization group approach. At small t ′ and at van Hove band fillings anti-ferromagnetism dominates, while with increasing t ′ or changing filling anti-ferromagnetism is replaced by d-wave superconductivity. Near t ′ = t/2 and close to van Hove band fi...

Abstract We investigate the location of zeros for partition function anti-ferromagnetic Ising model, focusing on lying unit circle. give a precise characterization class rooted Cayley trees, showing that are nowhere dense most interesting circular arcs. In contrast, we prove when considering all graphs with given degree bound, in sub-arc, implying trees this sense not extremal. The proofs rely ...

It is experimentally established that charge current flowing in a channel with spin-momentum locking such as topological insulator surface states or Rashba interfaces induces a spin voltage, which can be electrically measured with a ferromagnetic contact along the current path. Using this fact in conjunction with Onsager reciprocity arguments, we make the surprising prediction that the anti-par...

We present a theoretical analysis of current driven ferromagnetic resonance in a ferromagnet– normal-metal–ferromagnet tri-layer. This method of driving ferromagnetic resonance was recently realized experimentally by Tulapurkar et al. [Nature 438, 339 (2005)] and Sankey et al. [Phys. Rev. Lett. 96, 227601 (2006)]. The precessing magnetization rectifies the alternating current applied to drive t...

Anti-ferromagnetic materials have the possibility to offer ultra fast, high data density spintronic devices. A significant challenge is reliable detection of state antiferromagnet, which can be achieved using exchange bias. Here we develop an atomistic spin model athermal training effect, a well known phenomenon in biased systems where bias significantly reduced after first hysteresis cycle. We...

We have demonstrated spin pumping from a paramagnetic state of an insulator La2NiMnO6 into a Pt film. Single-crystalline films of La2NiMnO6 which exhibit a ferromagnetic order at TC≈270  K were grown by pulsed laser deposition. The inverse spin Hall voltage induced by spin-current injection has been observed in the Pt layer not only in the ferromagnetic phase of La2NiMnO6, but also in a wide te...

We propose a method of activating an enzyme utilizing heat generation from ferromagnetic particles under an ac magnetic field. We immobilize α-amylase on the surface of ferromagnetic particles and analyze its activity. We find that when α-amylase/ferromagnetic particle hybrids, that is, ferromagnetic particles, on which α-amylase molecules are immobilized, are subjected to an ac magnetic field,...