3,585 research outputs found
Quantum Interference of Force
We show that a quantum particle subjected to a positive force in one path of
a Mach-Zehnder interferometer and a null force in the other path may receive a
negative average momentum transfer when it leaves the interferometer by a
particular exit. In this scenario, an ensemble of particles may receive an
average momentum in the opposite direction of the applied force due to quantum
interference, a behavior with no classical analogue. We discuss some
experimental schemes that could verify the effect with current technology, with
electrons or neutrons in Mach-Zehnder interferometers in free space and with
atoms from a Bose-Einstein condensate.Comment: 5 figures. Accepted in Quantum on 2018-12-0
High frequency magnetic behavior through the magnetoimpedance effect in CoFeB/(Ta, Ag, Cu) multilayered ferromagnetic thin films
We studied the dynamics of magnetization through an investigation of the
magnetoimpedance effect in CoFeB/(Ta, Ag, Cu) multilayered thin films grown by
magnetron sputtering. Impedance measurements were analyzed in terms of the
mechanisms responsible for their variations at different frequency intervals
and the magnetic and structural properties of the multilayers. Analysis of the
mechanisms responsible for magnetoimpedance according to frequency and external
magnetic field showed that for the CoFeB/Cu multilayer, ferromagnetic resonance
(FMR) contributes significantly to the magnetoimpedance effect at frequencies
close to 470 MHz. This frequency is low when compared to the results obtained
for CoFeB/Ta and CoFeB/Ag multilayers and is a result of the anisotropy
distribution and non-formation of regular bilayers in this sample. The MImax
values occurred at different frequencies according to the used non-magnetic
metal. Variations between 25% and 30% were seen for a localized frequency band,
as in the case of CoFeB/Ta and CoFeB/Ag, as well as for a wide frequency range,
in the case of CoFeB/Cu.Comment: 14 pages, 5 figure
Tunable asymmetric magnetoimpedance effect in ferromagnetic NiFe/Cu/Co films
We investigate the magnetization dynamics through the magnetoimpedance effect
in ferromagnetic NiFe/Cu/Co films. We observe that the magnetoimpedance
response is dependent on the thickness of the non-magnetic Cu spacer material,
a fact associated to the kind of the magnetic interaction between the
ferromagnetic layers. Thus, we present an experimental study on asymmetric
magnetoimpedance in ferromagnetic films with biphase magnetic behavior and
explore the possibility of tuning the linear region of the magnetoimpedance
curves around zero magnetic field by varying the thickness of the non-magnetic
spacer material, and probe current frequency. We discuss the experimental
magnetoimpedance results in terms of the different mechanisms governing the
magnetization dynamics at distinct frequency ranges, quasi-static magnetic
properties, thickness of the non-magnetic spacer material, and the kind of the
magnetic interaction between the ferromagnetic layers. The results place
ferromagnetic films with biphase magnetic behavior exhibiting asymmetric
magnetoimpedance effect as a very attractive candidate for application as probe
element in the development of auto-biased linear magnetic field sensors.Comment: 5 figure
Controlpec 1.0: controle financeiro simplificado para a fazenda de pecuĂĄria de corte.
A maioria dos produtores de gado de corte nĂŁo realiza adequadamente o controle de receitas e despesas de sua atividade. Como a lucratividade da pecuĂĄria de corte tem se reduzido pela queda no preço de seus produtos e pela alta nos custos de produção, tal função tornou-se crucial para aqueles que querem se manter no negĂłcio. Para atender essa demanda, a Embrapa Gado de Corte desenvolveu, em ambiente Excel, o Controlpec 1.0, uma ferramenta simples e de fĂĄcil utilização pelos produtores. Com base no movimento financeiro da fazenda sĂŁo gerados relatĂłrios que consolidam despesas, receitas e margens econĂŽmicas da atividade, tendo em conta o plano de contas definido pelo usuĂĄrio. Os resultados sĂŁo expostos para cada mĂȘs do ano e para todo o ano.bitstream/CNPGC-2010/11811/1/DOC162PaimControlpec.pd
Caracterização da composição nutricional do pinhao in natura e cozido (Araucaria angustifolia).
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