کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1799380 1524842 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Inversion of exchange bias and complex magnetization reversal in full-nitride epitaxial γ′-Fe4N/CoN bilayers
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Inversion of exchange bias and complex magnetization reversal in full-nitride epitaxial γ′-Fe4N/CoN bilayers
چکیده انگلیسی


• Exchange bias (EB) sign reverses from negative to positive with increasing temperature in epitaxial γ′-Fe4N/CoN bilayers.
• The positive EB can be attributed to the antiferromagnetic interfacial coupling and frustrated interfacial spin structures.
• The EB transition temperature is not monotonically dependent on CoN thickness tCoN.
• For a 4-nm γ′-Fe4N, the unusual hysteresis loops are observed.

Exchange bias has been observed in the full-nitride epitaxial γ′-Fe4N/CoN bilayers. With the increase of temperature, the sign of exchange bias (EB) is inverse, which is independent on the cooling field and training effect. This novel behavior appears in the bilayers with different CoN and γ′-Fe4N thicknesses. The inversion of EB sign not only occurs at low temperatures, but also takes place even at 200 K for the 10 and 12 nm thick CoN layer. With the decreased γ′-Fe4N layer thickness, the inversion temperature of EB sign shows a roughly increased tendency. For the bilayer with a 4 nm-thick γ′-Fe4N, the interfacial magnetization reversal presents a complex trend, which is considered as the combined actions of the disordered ferromagnetic spins and various competed magnetic structures. This new manifestation of EB has been discussed in terms of the complicated interfacial spin structures and frustration effects due to the competition between the ferromagnetic and antiferromagnetic exchange interactions at the interface.

Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 379, 1 April 2015, Pages 124–130
نویسندگان
, , , ,