We present polarisation profiles for 48 southern pulsars observed with the new 10cm receiver at the Parkes telescope. We have exploited the low system temperature and high bandwidth of the receiver to obtain profiles which have good signal to noise for most of our sample at this relatively high frequency. Although, as expected, a number of profiles are less linearly polarised at 3.1 GHz than at...

Halfmetal-semiconductor interfaces are crucial for hybrid spintronic devices. Atomically sharp interfaces with high spin polarisation are required for efficient spin injection. In this work we show that thin film of half-metallic full Heusler alloy Co2FeSi0.5Al0.5 with uniform thickness and B2 ordering can form structurally abrupt interface with Ge(111). Atomic resolution energy dispersive X-ra...

A lot of work has been devoted to the study of the magnetic interactions between two paramagnetic centres bridged by an aromatic ring.[1] The study of the spin delocalisation and polarisation effects is helpful in order to understand the nature of these magnetic interactions. The spin-polarisation mechanism itself provides a key tool for predicting the kind of magnetic interactions in high-spin...

Exclusive electroproduction of π + mesons was studied by scattering 27.6 GeV positrons or electrons off a gaseous hydrogen target. The spin-averaged cross section and the single-spin azimuthal asymmetry with respect to transverse target polarisation were measured as a function of the Man-delstam variable t, the Bjorken scaling variable x B , and the virtuality Q 2 of the exchanged photon. The r...

This dissertation argues a quantum theory for higher-spin fields. Causality is discussed in both classical and quantum senses in a field theory. Renormalizability is also considered. Equations of motion are derived from a generalised concept of linearised Christoffel symbols for these higher-spin fields. It is seen that a minimally-coupled Rarita-Schwinger field violates causality, and that sup...

When light is passing through a rotating medium the optical polarisation is rotated. Recently it has been reasoned that this rotation applies also to the transmitted image (Padgett et al. 2006). We examine these two phenomena by extending an analysis of Player (1976) to general electromagnetic fields. We find that in this more general case the wave equation inside the rotating medium has to be ...

Here, and in a sequel, we invoke the invariant spin field to provide an in–depth study of spin motion at and near low order orbital resonances in a simple model for the effects of vertical betatron motion in a storage ring with Siberian Snakes. This leads to a clear understanding, within the model, of the behaviour of the beam polarisation at and near so–called snake resonances in proton storag...

The precision physics program of the ILC requires precise knowledge of the state of beam polarisation. In fact the Compton polarimeters intended for the ILC will have to measure the polarisation with error a factor of 2 smaller than the previous best measurement at the SLAC SLD experiment. In order to further reduce measurement error, spin tracking simulations in the ILC Beam Delivery System su...

One of the missing keys in the present understanding of the spin structure of the nucleon is the contribution from the gluons: the so-called gluon polarisation. This quantity can be determined in DIS through the Photon-Gluon Fusion (PGF) process, in which two analysis methods may be used: (i) identifying open charm events or (ii) selecting events with high-p T hadrons. The data used in the pres...

We comment on the proposed measurement of the spin-depolarisation parameter Dnn in the strangeness-exchange reaction p̄p → ΛΛ. It is shown that the existing data on the correlation coefficients Cij limit the range allowed for Dnn. There is a renewed interest in the strangeness-exchange reaction p̄p → ΛΛ, due to the results of PS185 collaboration at CERN, which has measured the cross-section σ, th...