RESUMO
As CMOS technologies face challenges in dimensional and voltage scaling, the demand for novel logic devices has never been greater, with spin-based devices offering scaling potential, at the cost of significantly high switching energies. Alternatively, magnetoelectric materials are predicted to enable low-power magnetization control, a solution with limited device-level results. Here, we demonstrate voltage-based magnetization switching and reading in nanodevices at room temperature, enabled by exchange coupling between multiferroic BiFeO3 and ferromagnetic CoFe, for writing, and spin-to-charge current conversion between CoFe and Pt, for reading. We show that, upon the electrical switching of the BiFeO3, the magnetization of the CoFe can be reversed, giving rise to different voltage outputs. Through additional microscopy techniques, magnetization reversal is linked with the polarization state and antiferromagnetic cycloid propagation direction in the BiFeO3. This study constitutes the building block for magnetoelectric spin-orbit logic, opening a new avenue for low-power beyond-CMOS technologies.
RESUMO
One of the major obstacles to realizing spintronic devices such as MESO logic devices is the small signal magnitude used for magnetization readout, making it important to find materials with high spin-to-charge conversion efficiency. Although intermixing at the junction of two materials is a widely occurring phenomenon, its influence on material characterization and the estimation of spin-to-charge conversion efficiencies are easily neglected or underestimated. Here, we demonstrate all-electrical spin-to-charge conversion in BixSe1-x nanodevices and show how the conversion efficiency can be overestimated by tens of times depending on the adjacent metal used as a contact. We attribute this to the intermixing-induced compositional change and the properties of a polycrystal that lead to drastic changes in resistivity and spin Hall angle. Strategies to improve the spin-to-charge conversion signal in similar structures for functional devices are discussed.
RESUMO
Objetivos: establecer la prevalencia del síndrome metabólico y sus componentes en la población urbana del municipio de El Retiro, localizado en el departamento de Antioquia, noroccidente de Colombia utilizando los criterios del ATP III.Materiales y Métodos: del total de la población mayor de 20 años mediante un muestreo aleatorio por conglomerados se evaluaron 381 sujetos, a quienes se les realizó una encuesta sistematizada y se les tomó la presión arterial en el brazo derecho sentados, el peso en kilogramos, la talla en centímetros y las circunferencias de cintura y cadera. A 365 sujetos en ayunas se les determinó la glucemia, colesterol total, triglicéridos, colesterol HDL y por fórmula de Friedewald el colesterol LDL. El análisis estadístico se realizó mediante EPI-INFO y STATA 6.0 tomando como significativa una p < 0.05. Resultados: la prevalencia ajustada a la edad encontrada para cada uno de los factores fue la siguiente: hiperglucemia (Glucemia > 110 mg/dl o diabetes previa) 12.5 por ciento, hipertrigliceridemia (TG >150 mg/dl) 32.16 por ciento, disminución del colesterol HDL (<40 mg/dl) 38.87 por ciento, hipertensión (PA > 130/85 mmHg o hipertensión previa) 48.58 por ciento, circunferencia cintura (H > 102 cm, M > 88 cm) 27.6 por ciento. La prevalencia ajustada a la edad del síndrome metabólico según los criterios de ATP III por la presencia de 3 ó más de sus componentes fue de 23.64 por ciento.Conclusiones: el síndrome metabólico tiene la alta prevalencia de (23 por ciento) en El Retiro Antioquia. Debido a su impacto en la salud de la población y a que la piedra angular en su tratamiento es disminuir de peso y aumentar la actividad física, se deberían plantear estrategias para lograr estos objetivos
Objetive: to establish the prevalence of the metabolic syndrome and its components using ATPIII criteria in the urban population of El Retiro, located in the Antioquia department, in the northwestern region of Colombia. Materials and methods: 381 subjects were evaluated from the total population older than 20, by means of a random conglomerate sampling. A systematic interview was answered, and records of blood pressure taken in the right arm in sitting position, weight in kilograms, height in centimeters and circumference of waist and hip were taken. In 365 subjects, glycemia, total cholesterol, triglicerides and HDL cholesterol were determined in the fasting state. LDL cholesterol was determined using the Fridewald formula. The statistical analysis was made using EPI-INFO and STATA 6.0, with significant p value < 0.05. Results: for each one of the factors, the prevalence adjusted to age was as follows: hyperglycemia (Glycemia>110 mg/dl or previous diabetes) 12.5%, hypertriglyceridemia (TG>150 mg/dl) 32.16%, low HDL cholesterol (<40 mg/dl) 38.87%, hypertension (BAP>130/85 mmHg or previous hypertension 48.58%, waist circumference (M>102 cm, F>88 cm) 27.6%. The age adjusted prevalence of the metabolic syndrome, using the criteria of ATP III because of the presence of three or mores of its components was 23.64%. Conclusions: there is a high prevalence of the metabolic syndrome in El Retiro, Antioquia. Due to its impact in the health of the general population and because the cornerstone of its treatment is weight loss and increased physical activity, these activities should be proposed to reach therapeutically goals
