کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1800991 1024555 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Medium range ordering and some magnetic properties of amorphous Fe90Zr7B3 alloy
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Medium range ordering and some magnetic properties of amorphous Fe90Zr7B3 alloy
چکیده انگلیسی

High-resolution electron microscopy (HREM) reveals in the as-quenched Fe90Zr7B3 alloy the existence of medium range ordered (MRO) regions 1–2 nm in size. Transmission Mössbauer spectroscopy confirms that these regions are α-Fe MRO ones. Above the Curie point of the amorphous phase (TC=(257±2)K) they behave like non-interacting superparamagnetic particles with the magnetization decreasing linearly with the temperature. For these particles the average magnetic moment of 390μB and the average size of 1.7 nm, in excellent agreement with HREM observations, were estimated. The maximum of the isothermal magnetic entropy change at the maximum magnetizing field induction of 2 T occurs at the Curie temperature of the amorphous phase and equals to 1.05 Jkg−1 K−1. The magnetic entropy changes exhibit the linear dependence on the maximum magnetizing field induction in the range 0.5–2 T below, near and above TC. Such correlations are attributed to superparamagnetic behavior of α-Fe MRO regions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 322, Issue 18, September 2010, Pages 2696–2702
نویسندگان
,