共查询到18条相似文献,搜索用时 78 毫秒
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利用磁控溅射方法制备了纳米Co/Cu多层膜。利用扫描探针显微镜(SPM)观测了其表面形貌和磁畴结构,并通过振动样品磁强计(VSM)测量了磁性。结果表明,薄膜的微结构和磁性随非磁性层厚度的变化有着非常显著的变化。超细Co颗粒构造的多层膜样品,颗粒尺寸逐渐增大,磁畴尺寸先减小后增大,最后发生明显的聚集。磁性金属和非磁性金属的比例对多层膜之间的交换耦合相互作用有显著影响。平行膜面方向上的饱和场明显小于垂直膜面方向。当体积比约为1∶80时,平行膜面方向饱和场为95.9 kA/m,垂直方向饱和场为328.1 kA/m。此时两个方向上的饱和场、剩磁、矫顽力和磁滞损耗均为最小值。 相似文献
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Au/Fe磁性多层膜在离子束混合过程中的巨磁电阻效应在线研究 总被引:1,自引:0,他引:1
在离子束混合条件下,在线研究了Au/Fe磁性多层膜转变为纳米颗粒膜过程中的巨磁电阻效应,发现了不同磁场强度下的离子束混合对巨磁电阻效应影响的初步规律,测量了不同注入剂量和磁场强度下的巨磁电阻,并对结果进行了讨论。 相似文献
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利用超高真空磁控溅射方法制备了一系列不同C层厚度的C/FePt/Fe纳米薄膜,然后进行原位高温退火。应用X射线衍射仪(XRD)分析了样品的晶体结构,利用扫描探针显微镜(SPM)观测了表面形貌和磁畴结构,通过振动样品磁强计(VSM)测量了磁性。结果表明,薄膜的微结构和磁特性随C覆盖层厚度的变化有着非常显著的变化。C的加入使样品表面更加光滑,使10 nm厚的C覆盖层样品获得了0.3 nm的粗糙度和3.8 nm的颗粒尺寸。C覆盖层减弱了磁性颗粒间的磁偶极作用,同时减弱了磁性颗粒间的交换耦合作用,提高了L10织构的有序化程度,进而增大了样品的矫顽力,矫顽力达到了987 kA/m。 相似文献
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采用磁控溅射工艺制备了TbDyFe-FeNi多层膜/光纤复合结构,并搭建M-Z干涉仪磁场检测系统对复合结构的磁敏性能进行试验测试.实验结果表明,在调制磁场频率为复合结构的固有频率的条件下,系统对磁场信号感应强度最大;系统输出信号大小随调制磁场强度线性增加,添置恒定直流磁场后,系统响应信号大小明显增强.在0~48 kA/m的直流磁场范围内,干涉仪(传感臂有效长度为10 cm)信号响应灵敏度为6.05×10-5rad/(√Hz·kA·m-1);当多层膜厚度增加到5 μm时,干涉仪信号响应灵敏度变为6.07×10-5rad/(√Hz·kA·m-1). 相似文献
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Patterns separated by approximately 55-nm-wide lines on Co/Pt multilayers have been fabricated using a focused ion beam with
a 30-keV Ga+ ion source. The ion irradiation allows the magnetic moment in the irradiated lines to rotate 45 deg to 90 deg toward the
film plane. The in-plane magnetization component of the irradiated lines increases as the ion dose increases. The balance
of incoming and outgoing flux at intersections is maintained in orthogonal patterns, while exceptions have been observed in
hexagonal and triangular patterns. In all patterns, irradiated lines and adjacent unirradiated elements have no magnetic interaction. 相似文献
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Co/Pt multilayer dots arrays with 580-nm periodicity were fabricated using Laser interference lithog-raphy (LIL) and an ion-beam milling technique. We ob-tained uniform dots arrays with a large area by optimiz-ing the exposure parameters and improving exposure con-ditions. We obtained their shapes and magnetic domain structures and investigated using an Atomic force micro-scope (AFM) and Magnetic force microscope (MFM). The AFM and MFM images show: 1) when their size is smaller than 400nm, the dots are in single-domain state and their shape tends to be circular; and 2) when their size is greater than 400nm, the dots are in multi-domain state and they tend to form squares. The dots arrays possibly can be used in nano-scale magnetic storage. 相似文献
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Robert L. Stamps 《Advanced functional materials》2010,20(15):2380-2394
Modification and control of material properties through careful manipulation of geometry on nano‐ and sub‐nanometer length scales is a cornerstone of modern materials science and technology. An exciting area in which these concepts have provided exceptional advances has been magnetoelectronics and nanomagnetism. Important scales in magnetic metals are conduction spin diffusion lengths and distances over which local moments correlate. Advanced techniques now allow for the creation of structures patterned on these length scales in three dimensions. The focus of this article is on magnetic structures whose dynamic properties can be strongly modified by ion bombardment and lithographic patterning. Examples are given of how microwave frequency properties can be tuned with external fields, how factors controlling magnetic switching can be controlled, and how manipulation of magnetic domain walls can be used to reveal new and surprising phenomena. 相似文献
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Verónica Salgueiriño‐Maceira Miguel A. Correa‐Duarte Manuel Bañobre‐López Marek Grzelczak Michael Farle Luis M. Liz‐Marzán José Rivas 《Advanced functional materials》2008,18(4):616-621
Several nanometer‐scale technological applications rely on the promising scenario of highly anisotropic magnetic materials. Bearing this in mind, we have studied the structure, magnetic properties, and interfacial exchange anisotropy effects of unique wires of Ni/NiO synthesized using carbon nanotubes as substrates. Structural analyses of these nanocomposites in correlation with magnetic measurements show that the crystalline NiO outer shells cause an enhanced exchange bias, providing an extra source of anisotropy that leads to their magnetization stability. These Ni/NiO nanowires, with a spin‐glass‐like behavior and with their magnetic moments in a blocked state over a wide temperature range that includes room temperature, should therefore inspire further study concerning the applicability of anisotropic structures. 相似文献