Effects of rare earth La on microstructure and properties of Ag–21Cu–25Sn alloy ribbon prepared by melt spinning

Xue, Ming; Li, Liangfeng; Zhang, Zuhua; Wang, Hao; Wang, Enze; Qiu, Tai

doi:10.1016/j.matdes.2015.05.083

Cited by 10 publications

(1 citation statement)

References 13 publications

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“…Solidification of melted alloys by melt spinning is used provides very high cooling rates of up to 10 6 K/s. 21 The quenched Ag-Mn alloys fosters phase separation, chemical disproportionation and a resultant large exchange bias at low temperatures. 22 The origin of such unidirectional anisotropy, recently observed as well in MnAl and Mn-based Heusler melt-spun alloys, 23,24,25 resides in fluctuations of Mn content that produces adjacent exchange-coupled nanoscopic regions with predominant FM and AF character.…”

Section: Introductionmentioning

confidence: 99%

Short-range structural and magnetic order in rapidly-solidified Ag Mn alloys

et al. 2016

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Short-range structural and magnetic order in rapidly solidified nanostructured Ag100-xMnx alloys featuring nominal large Mn content (x = 25, 32, 40 at.%), well above the maximum equilibrium concentration (x ~ 14 at.%), are quantified using x-ray, neutron and magnetic probes. These inhomogenous alloys contain coexisting Mn-rich and Mn-deficient nanoscopic face-centeredcubic-type phases. Interaction between these regions provides large exchange bias at low temperature, with the magnitude of the unidirectional anisotropy field increasing gradually with increased Mn concentration. Neutron diffraction data reveal no evidence of long-range antiferromagnetic ordering but instead identifies short-range structural order from the presence of a diffuse scattering peak that evolves with Mn content. Moderate annealing temperatures (Tann = 350 °C) promote homogenization of the Mn content in the alloys with subsequent suppression of exchange bias, confirming the above model. A strong interfacial exchange density between Mndeficient and the Mn-rich nanocrystalline phases exists that is determined to be of the same order of magnitude as that found in other exchange-biased ferromagnetic/antiferromagnetic systems. The intriguing behavior of these AgMn alloys as a function of temperature, of Mn content and of annealing condition highlights options to manipulate and tailor their magnetic attributes such as interface exchange and magnetic anisotropy.

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