Reducing extrinsic hysteresis in first-order La(Fe,Co,Si)13 magnetocaloric systems

Moore, J. D.; Morrison, K.; Sandeman, K. G.; Katter, M.; Cohen, L. F.
December 2009
Applied Physics Letters;12/21/2009, Vol. 95 Issue 25, p252504
Academic Journal
Simultaneous magnetization and sample temperature measurements were performed as a function of magnetic field and magnetic field sweep-rates to study the influence of these conditions on the hysteresis of the magnetocaloric transition in La(Fe1-x-yCoxSiy)13 samples. The large magnetocaloric effect in the compounds that show a first-order transition cause a significant departure from isothermal conditions leading to dynamic sweep-rate dependent magnetic hysteresis. Here we show how this deleterious effect can be greatly reduced by changing the sample geometry or by use of materials which show a second-order transition only. The key signatures of nonisothermal conditions in the magnetization data are highlighted.


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