Factors affecting the performance of 1 H heteronuclear decoupling sequences for magic-angle spinning (MAS) NMR spectroscopy of organic solids are explored, as observed by time constants for the decay of nuclear magnetisation under a spin-echo (T2' ). By using a common protocol over a wide range of experimental conditions, including very high magnetic fields and very high radio-frequency (RF) nu...

A strong influence of external magnetic fields on the relaxation time constant T1 of glass cells serving as reservoirs for polarised He, observed for various alkali metal coated cells made of different glass types, was initially associated with the presence of a large number of ferromagnetic clusters on the glass surface. Later experiments showed the presence of the socalled ”T1 hysteresis” phe...

The magnetisation dynamics of the vortex core and Landau pattern of magnetic thin-film elements has been studied using holography with extended reference autocorrelation by linear differential operator (HERALDO). Here we present the first time-resolved x-ray measurements using this technique and investigate the structure and dynamics of the domain walls after excitation with nanosecond pulsed m...

The development of efficient, energy-saving, and automated manufacturing free-form variable-thickness polymer composite components has created a step-change enabled technology for the composites industry seeking geometry tailoring during mould-less and/or additive such as that in 3D printing. current article presents research on magnetic field assisted printing iron particles-embedded thermopla...

A numerical model based upon the "Stoner-Wohlfarth theory" has been developed to predict Isothermal Remanent Magnetisation (IRM) curves for a system of fine particles with uniaxial anisotropy. This paper reports the predictions of our model for the effects of easy axes alignment on the IRM curve. We have also investigated the effect of the standard deviation after the application of a non-satur...

Coherent Raman scattering in combination with optical heterodyne detection provides an attractive new technique for the measurement of electron paramagnetic resonance (EPR). The technique is applicable to both electronic ground and excited states. In contrast to conventional ODMR techniques, it monitors the precessing magnetisation and produces phase-sensitive spectra. We have demonstrated the ...

We report large systematic errors in Monte Carlo simulations of the tri-critical Blume-Capel model using single spin Metropolis updating. The error, manifest as a 20% asymmetry in the magnetisation distribution, is traced to the interplay between strong triplet correlations in the shift register random number generator and the large tricritical clusters. The effect of these correlations is visi...

We present different effective-field and cluster-variation treatments of the magnetic spin-: Ising model for a fraction x of frozen-in or quenched non-magnetic impurities. The resulting picture for the critical curve. magnetisation, energy, specific heat and susceptibility is simple and compares very well with Monte Carlo and experimental data. Our results can thus be useful in the analysis of ...

A series of compounds with compositions Fe 5 Si 1-x Ge x B 2 were synthesised and their structural magnetic properties investigated. The Mo SiB -type structure tetragonal I 4/ mcm space group is maintained for all < 0.15 , which estimated as the compositional limit system. unit cell parameters expand content before reaching a plateau = 5.5581(1) c 10.3545(1) Å at . saturation magnetisation ( M ...