Spin-Hall and Anisotropic Magnetoresistance in Ferrimagnetic Co-Gd / Pt layers

We present the Co-Gd composition dependence of the spin-Hall magnetoresistance (SMR) and anisotropic magnetoresistance (AMR) for ferrimagnetic Co100-xGdx / Pt bilayers. With Gd concentration x, its magnetic moment increasingly competes with the Co moment in the net magnetization. We find a nearly compensated ferrimagnetic state at x = 24. The AMR changes sign from positive to negative with increasing x, vanishing near the magnetization compensation. On the other hand, the SMR does not vary significantly even where the AMR vanishes. These experimental results indicate that very different scattering mechanisms are responsible for AMR and SMR. We discuss a possible origin for the alloy composition dependence.Comment: 31 Pages, 9 figure

Relação da força de preensão com a composição corporal e indicadores laboratoriais de diabéticos e hipertensos

Introduction: The change in handgrip strength (HGS) is an indicator of the emergence of some chronic diseases, such as diabetes mellitus (DM) and systemic arterial hypertension (SAH). Objective: Analyze the relationship between HGS and body composition and laboratory indicators of diabetic and hypertensive patients assisted in Primary Health Care. Methods: The sample consisted of 185 users of a Basic Health Unit in the city of Santarém, Pará, distributed into two groups: control (CTL) – users without a diagnosis of DM and/or SAH (n=66); and DM/SAH (n=119) – users with DM or SAH or both diseases. Data collection involved sociodemographic, clinical, anthropometric, biochemical, and HGS information. Data were analyzed using descriptive and inferential statistics, adopting p<0.05. Results: It was noted that low HGS in the DM/SAH group was associated with high values of body mass index, abdominal circumference, fat percentage, fat mass, total cholesterol, and triglycerides and with more factors for metabolic syndrome (p<0.05). The CTL group, in relation to DM/SAH for the same HGS classification, demonstrated significance for lower blood pressure values, body mass index, abdominal circumference, fat percentage, and fat mass, as well as a lower chance of developing metabolic syndrome (p<0.05). Conclusion: According to the study proposal, it is concluded that the evaluation and follow-up of HGS in individuals with chronic diseases,especially DM and SAH, is relevant to monitor body adiposity and dyslipidemia and avoid the aggravation of existing diseases or the emergence of new ones.Introdução: A alteração na força de preensão (FP) manual é indicador para surgimento de algumas doenças crônicas, como a diabetes mellitus (DM) e hipertensão arterial sistêmica (HAS). Objetivo: Analisar a relação da FP com a composição corporal e indicadores laboratoriais de diabéticos e hipertensos assistidos na Atenção Primária à Saúde. Métodos: A amostra foi composta por 185 usuários de uma Unidade Básica de Saúde na cidade de Santarém,Pará, sendo distribuídos em dois grupos: controle (CTL) – usuários sem o diagnóstico para DM e/ou HAS (n=66); e DM/HAS (n=119) – usuários com DM ou HAS ou as duas doenças. A coleta de dados envolveu informações sociodemográficas, clínicas, antropométricas, bioquímicas e FP. Os dados foram analisados por estatística descritiva e inferencial, adotando-se p<0,05. Resultados: Notou-se que a FP baixa no grupo DM/HAS apresentou associaçãocom valores elevados do índice de massa corporal, circunferência abdominal, percentual de gordura, massa gorda, colesterol total, triglicerídeos e com mais fatores para a síndrome metabólica (p<0,05). Já o grupo CTL, em relação do DM/HAS para uma mesma classificação de FP, demonstrou significância para menores valores pressóricos, do índice de massa corporal, da circunferência abdominal, percentual de gordura, massa gorda, bem como menor chance para o desenvolvimento da síndrome metabólica (p<0,05). Conclusão: Conclui-se, conforme a proposta do estudo, que é relevante a avaliação e acompanhamento da FP em indivíduos com doenças crônicas, em especial a DM e a HAS, a fim de monitorar a adiposidade corporal e a dislipidemia, evitando o agravo das doenças instaladas ou o surgimento de novas

The Type Ia supernovae rate with Subaru/XMM-Newton Deep Survey

We present measurements of the rates of high-redshift Type Ia supernovae derived from the Subaru/XMM-Newton Deep Survey (SXDS). We carried out repeat deep imaging observations with Suprime-Cam on the Subaru Telescope, and detected 1040 variable objects over 0.918 deg$^2$ in the Subaru/XMM-Newton Deep Field. From the imaging observations, light curves in the observed $i'$-band are constructed for all objects, and we fit the observed light curves with template light curves. Out of the 1040 variable objects detected by the SXDS, 39 objects over the redshift range $0.2 < z < 1.4$ are classified as Type Ia supernovae using the light curves. These are among the most distant SN Ia rate measurements to date. We find that the Type Ia supernova rate increase up to $z \sim 0.8$ and may then flatten at higher redshift. The rates can be fitted by a simple power law, $r_V(z)=r_0(1+z)^\alpha$ with $r_0=0.20^{+0.52}_{-0.16}$(stat.)$^{+0.26}_{-0.07}$(syst.)$\times 10^{-4} {\rm yr}^{-1}{\rm Mpc}^{-3}$, and $\alpha=2.04^{+1.84}_{-1.96}$(stat.)$^{+2.11}_{-0.86}$(syst.).Comment: 21 pages, 16 figures, accepted to PAS

Rest-Frame R-band Lightcurve of a z~1.3 Supernova Obtained with Keck Laser Adaptive Optics

We present Keck diffraction limited H-band photometry of a z~1.3 Type Ia supernova (SN) candidate, first identified in a Hubble Space Telescope (HST) search for SNe in massive high redshift galaxy clusters. The adaptive optics (AO) data were obtained with the Laser Guide Star facility during four observing runs from September to November 2005. In the analysis of data from the observing run nearest to maximum SN brightness, the SN was found to have a magnitude H=23.9 +/- 0.14 (Vega). We present the H-band (approximately rest-frame R) light curve and provide a detailed analysis of the AO photometric uncertainties. By constraining the aperture correction with a nearby (4" separation) star we achieve 0.14 magnitude photometric precision, despite the spatially varying AO PSF.Comment: 11 pages, 8 figures, Accepted for Publication in AJ Updated the citations, fixed typo