Intrinsic exchange bias in Zn$ x$Mn$ {3-x}$O$ 4$ $x leq 1$ solid solutions - Condensed Matter > Materials ScienceReportar como inadecuado




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Abstract: Bulk specimens of the hetaerolite solid solution Zn$ x$Mn$ {3-x}$O$ 4$, with$x$ = 0, 0.25, 0.5, 0.75, and 1 have been prepared as homogeneous, phase-purepolycrystalline samples as ascertained by neutron diffraction measurements.Samples with $x$ = 0.25, 0.5, and 0.75 exhibit shifted magnetic hysteresisloops at low temperature, characteristic of exchange bias typically seen inmagnetic composites. We propose that the unusual magnetic behavior arises as aresult of a nanoscale mixture of ferrimagnetic and antiferromagnetic regionsthat are distinct but lack long-range order. While some glassy behavior is seenin AC magnetic measurements, its magnitude is not sufficient to account for theobserved dramatic exchange bias. Furthermore, isothermal and thermoremanentmagnetization measurements distinguish this material from a pure spin glass.The title system offers insights into the alloying of a ferrimagnet Mn$ 3$O$ 4$with an antiferromagnet ZnMn$ 2$O$ 4$ wherein distinct magnetic clusters growand percolate to produce a smooth transition between competing orders.



Autor: Daniel P. Shoemaker, Ivana Sabaj Abumohor, Efrain E. Rodriguez, Thomas Proffen, Ram Seshadri

Fuente: https://arxiv.org/







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