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Effect of swift heavy ion irradiation in Fe/W multilayer structures

机译:快速重离子辐照对Fe / W多层结构的影响

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Present study reports effect of swift heavy ion irradiation on structural and magnetic properties of sputtered Fe/W multilayer structures (MLS) having bilayer compositions of [Fe(20 A)/W(10 A)]_(5BL) and [Fe(20 A)/W(30 A)]_(5BL-) These MLS are irradiated by 120 MeV Au~(9+) ions up to fluence of 4 × 10~(13) ions/cm~2. X-ray reflectivity (XRR), wide-angle X-ray diffraction (WAXD), cross-sectional transmission electron microscopy (X-TEM) and magneto optical Kerr effect (MOKE) techniques are used for structural and magnetic characterization of pristine and irradiated MLS. Analysis of XRR data using Parratt's formalism shows a significant increase in W/Fe interface roughness. WAXD and X-TEM studies reveals that intra-layer microstructure of Fe-layers in MLS becomes nano-crystalline on irradiation. MOKE study shows increase in coercivity at higher fluence, which may be due to increase in surface and interface roughness after recrystallization of Fe-layers.
机译:本研究报告了快速重离子辐照对具有[Fe(20 A)/ W(10 A)] _(5BL)和[Fe(20)双层组成的溅射Fe / W多层结构(MLS)的结构和磁性的影响A)/ W(30 A)] _(5BL-)这些MLS由120 MeV Au〜(9+)离子辐照至通量为4×10〜(13)离子/ cm〜2。 X射线反射率(XRR),广角X射线衍射(WAXD),横截面透射电子显微镜(X-TEM)和磁光克尔效应(MOKE)技术用于原始和辐照的结构和磁性表征MLS。使用Parratt形式主义的XRR数据分析显示W / Fe界面粗糙度显着增加。 WAXD和X-TEM研究表明,MLS中Fe层的层内微观结构在辐照下变为纳米晶体。 MOKE研究表明,在较高注量下矫顽力增加,这可能是由于铁层再结晶后表面和界面粗糙度的增加。

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