1,933 research outputs found
Evidence for polarised boron in Co-B and Fe-B alloys
By exploiting the tunability of synchrotron radiation in measurements of spin-resolved photoemission it has proved possible to obtain information on the polarisation of the valence electrons of Co-B and Fe-B amorphous magnetic alloys, Both the spin-integrated and spin-resolved energy distribution curves show a marked dependence on photon energy indicating that the p states of boron hybridise with the d states of the transition metals giving rise to mixed states in the binding energy range 1 to 5 eV, The observed polarisation and spin-resolved densities of states imply that in the above restricted energy range there is a net negative polarisation of the boron states
Emergency Portasystemic Shunting in Cirrhotics With Bleeding Varices ā A Comparison of Portacaval and Mesocaval Shunts
Despite the best conservative measures available for the control of major variceal hemorrhage, some
patients either continue to bleed, or rebleed early, and require emergency surgery. One hundred patients
with cirrhosis and uncontrolled bleeding were treated with emergency portasystemic shunts between 1968
and 1983. Fifty eight patients had end-to-side portacaval shunts and 42 had Dacron interposition mesocaval
shunts. Both groups were comparable with respect to age, sex and prevalence of alcoholism. There was an
increased severity of liver disease as assessed by Child's class in the mesocaval group of patients
Exchange anisotropy pinning of a standing spin wave mode
Standing spin waves in a thin film are used as sensitive probes of interface
pinning induced by an antiferromagnet through exchange anisotropy. Using
coplanar waveguide ferromagnetic resonance, pinning of the lowest energy spin
wave thickness mode in Ni(80)Fe(20)/Ir(25)Mn(75) exchange biased bilayers was
studied for a range of IrMn thicknesses. We show that pinning of the standing
mode can be used to amplify, relative to the fundamental resonance, frequency
shifts associated with exchange bias. The shifts provide a unique `fingerprint'
of the exchange bias and can be interpreted in terms of an effective
ferromagnetic film thickness and ferromagnet/antiferromagnet interface
anisotropy. Thermal effects are studied for ultra-thin antiferromagnetic
Ir(25)Mn(75) thicknesses, and the onset of bias is correlated with changes in
the pinning fields. The pinning strength magnitude is found to grow with
cooling of the sample, while the effective ferromagnetic film thickness
simultaneously decreases. These results suggest that exchange bias involves
some deformation of magnetic order in the interface region.Comment: 7 pages, 7 figure
Preoperative Kidney Function linked to mortality and readmission outcomes at Day 90 and 30 in Older Emergency Surgical Patients
Grants were received from British Geriatric Society and The Renal Association to support Louis EvansPeer reviewedPublisher PD
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