The Study of Exchange Bias Effect in PtxCo1-x/CoO Bilayers

We investigated the exchange bias effect in PtxCo1-x/CoO bilayers as a function of Pt concentration. Chemical analysis on the Pt Co-x(1-x) layer confirmed that x varies from 0.6 to 0.9 by 0.1 step. Hereby, we present magnetic anisotropy measurements as well as magnetic hysteresis measurements at low temperatures. It was found that exchange bias field and blocking temperature values of PtxCo1-x/CoO bilayers strongly depend on Pt concentration. Moreover, we showed that it is possible to obtain a higher exchange bias effect with a less Co content in PtCo alloy layers. Both blocking temperature and exchange bias effect results of the bilayer system were discussed with two different scenarios

Probing Exchange Bias Properties of Pt Co-x(1-x) /Pt/CoO Films

We present magnetic properties of bilayers consisting of antiferromagnetic CoO and ferromagnetic Pt (x) Co1-x film structure on Si (001) as Pt/PtCo/Pt/CoO/Pt. The CoO layer and the Pt (x) Co1-x layer thickness were kept constant (10 nm). In order to prevent PtCo ferromagnetic layer from oxidation, thin Pt (4 ) spacer layer was grown between PtCo and CoO layers. The chemical composition of Pt (x) Co1-x layers were changed from 0.1 to 0.5 and the exchange bias effect and blocking temperature of the structures were determined. Composition dependence of magnetization measurements showed that exchange bias effect took maximum value in Pt0.5Co0.5/Pt/CoO; on the other hand, its minimum value was observed on Pt0.3Co0.7/Pt/CoO. The spacer layer supplied positive contribution for exchange bias (EB) effect compared to bilayers without Pt spacer layer. The other result from composition-dependent measurements indicates that blocking temperatures exhibited oscillatory behavior and the highest value was obtained from Pt0.1Co0.9/Pt/CoO whereas the lowest value was measured from Pt0.3Co0.7/Pt/CoO. Blocking temperatures of all samples were lower than the N,el temperature of bulk CoO. According to these results, the manipulation of interface between PtCo and CoO layers gives us the possibility of tuning exchange bias effect with Pt concentration, temperature, and spacer Pt layer

EFFECT OF ANGIOTENSIN II RECEPTOR BLOCKER TELMISARTAN ON BONE FRACTURE HEALING IN RATS: RELATIONSHIP BETWEEN VEGF AND TELMISARTAN

WCO-IOF-ESCEO World Congress on Osteoporosis, Osteoarthritis and Musculoskeletal Diseases (WCO-IOF-ESCEO) -- MAR 26-29, 2015 -- Milan, ITALYWOS: 000373767100673…WCO, IOF, EsCE

Manipulation of Exchange Coupling in Py/Co/Cr Multi layer Thin Films

The main issue addressed in present study is exchange coupling modification between ferromagnetic layers through non-magnetic spacer layers using extra ultra-thin ferromagnetic layers (Co). In order to achieve this goal, we prepared Cr(50 angstrom) / Py(20 angstrom) / Co(5 angstrom) / Cr(7, 10, 13 angstrom) / Co(5 angstrom) / Py (30 angstrom) / Cr(50 angstrom) / Si using magnetron sputtering at UM' conditions and characterized by Ferromagnetic Resonance (FMR) technique. As the present study results were compared to our previous study on (Py/Cr), the exchange coupling energy was increased ten times with the cobalt thin laye

The Aquilegia genome: adaptive radiation and an extraordinarily polymorphic chromosome with a unique history

The columbine genus Aquilegia is a classic example of an adaptive radiation, involving a wide variety of pollinators and habitats. Here we present the genome assembly of A. coerulea "Goldsmith", complemented by high-coverage sequencing data from 10 wild species covering the world-wide distribution. Our analysis reveals extensive allele sharing among species, and sheds light on the complex process of radiation. We also present the remarkable discovery that the evolutionary history of an entire chromosome differed from that of the rest of the genome --- a phenomenon which we do not fully understand, but which highlights the need to consider chromosomes in an evolutionary context

Circumcision revision in male children

OBJECTIVE: To determine indications for circumcision revision and to identify the specialty of the person who performed unsatisfactory primary circumcision. MATERIALS AND METHODS: The authors reviewed medical records of 52 cases that underwent circumcision revision over a 6-year period (1998 to 2004). Sleeve surgical technique was used for revision in patients with redundant foreskin or concealed penis, penoplasty for partial or complete degloving of the penis and meatotomy for external meatal stenosis. The mean age of children was 32 months (range 6 months to 9 years). RESULTS: Most of unsatisfactory primary circumcisions (86.7%) were performed by laymen. All patients who underwent circumcision revision had good to excellent cosmetic results. CONCLUSION: Primary circumcision performed by laymen carry a high complication rate and serious complications may occur. A period of training and direct supervision by physicians is required before allowing laymen to perform circumcision independently