Exchange bias and interface electronic structure in Ni/Co3O4(011)

A detailed study of the exchange bias effect and the interfacial electronic structure in Ni/Co3O4(011) is reported. Large exchange anisotropies are observed at low temperatures, and the exchange bias effect persists to temperatures well above the Neel temperature of bulk Co3O4, of about 40 K: to ~80 K for Ni films deposited on well ordered oxide surfaces, and ~150 K for Ni films deposited on rougher Co3O4 surfaces. Photoelectron spectroscopy measurements as a function of Ni thickness show that Co reduction and Ni oxidation occur over an extended interfacial region. We conclude that the exchange bias observed in Ni/Co3O4, and in similar ferromagnetic metallic/Co3O4 systems, is not intrinsic to Co3O4 but rather due to the formation of CoO at the interface.Comment: 8 pages, 6 figures. Accepted for publication in Physical Review B

Aimantations principales du chlorure et du bromure chromiques

The curves describing as a function of temperature, and for different values of the magnetic field, the principal magnetizations of chromic chloride and bromide show that these compounds are antiferromagnetic below 16.8 and 37.7 °K respectively.Les courbes représentant en fonction de la température, et pour différentes valeurs du champ magnétique, les aimantations principales du chlorure et du bromure chromiques montrent que ces composés sont antiferromagnétiques au-dessous respectivement de 16,8 et 37,7 °K

Susceptibilités magnétiques principales des chlorure, bromure et iodure cobalteux

Below Tλ, the direction of antiferromagnetism is perpendicular to the crystal axis in CoCl2 and CoBr2, and parallel to this axis in CoI2. The susceptibility χ〉 of CoI2 increases as the temperature decreases below T λ.Au-dessous de Tλ, la direction d'antiferromagnétisme est normale à l'axe du cristal dans le cas de CoCl2 et de C OBr2, parallèle à cet axe dans le cas de CoI2. La susceptibilité χ〉 de CoI2 croît lorsque la température s'abaisse au-dessous de Tλ

Anterior cervical interbody fusion with hydroxyapatite graft and plate system

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