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Two series of samples of single-layer IrMn and IrMn/FePd bilayer films, deposited on a single-crystal MgO substrate at different IrMn deposition temperatures (Ts=300-700 °C), were investigated using magnetron sputtering. L12 ordering was revealed for the 30nm-thick IrMn epitaxial (001) films with Ts⩾400 °C, determined by synchrotron radiation x-ray diffractometry (XRD). XRD results also provide evidence of the epitaxial growth of the IrMn films on MgO substrate. Increasing Ts from 400 to 700 °C monotonically increases the ordering parameter of L12 phases from 0.17 to 0.81. An in-plane exchange bias field (Heb) of 22Oe is obtained in a 10nm-thick FePd film that is deposited on the disordered IrMn films. As the L12 ordering of the IrMn layers increases, the Heb gradually decreases to 0Oe, meaning that the exchange bias behavior vanishes. The increased surface roughness, revealed by atomic force microscopy, of the epitaxial IrMn layers with increasing Ts cannot be the main cause of the decrease in Heb due to the compensated surface spins regardless of the disordered and ordered (001) IrMn layers. The change of antiferromagnetic structure from the A1 to the L1H2 phase was correlated with the evolution of Heb. [ABSTRACT FROM AUTHOR]

Presents a study which performed magnetic and crystallographic measurements on the rare-earth iron boride systems. Details on permanent magnets based on rare-earth iron and boron; Materials and methods used; Results of the powder x-ray diffraction on the systems.

Presents information on a study which examined the magnetic and crystallographic properties of pseudoternary compounds of Nd[sub2](Fe[sub1-x]Cu[subx])[sub14]B. Measurement of magnetic properties of the compounds; Experimental details; Results and discussion; Conclusions.

Presents a study on anomalous perpendicular magnetoanisotropy in Mn[sub4]N films on Si(100). Description of Mn[sub4]N compound; Experimental setup; Magnetic properties of the films.