Intrinsic Magnetism and Collective Magnetic Properties of Size-Selected Nanoparticles

Intrinsic Magnetism and Collective Magnetic Properties of Size-Selected Nanoparticles
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尺寸选择的纳米粒子的固有磁性和集体磁性

DOI:
10.1007/978-3-642-28546-2_11
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发表时间:
2012
期刊:
影响因子:
--
通讯作者:
H. Wende
H. Wende
中科院分区:
--
文献类型:
--
作者:
C. Antoniak;N. Friedenberger;A. Trunova;R. Meckenstock;F. Kronast;K. Fauth;M. Farle;H. Wende

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以粒径选择性球形FePt纳米粒子和立方Fe/Fe氧化物纳米粒子为例,讨论了纳米磁体静态和动态性质测定的最新进展。同步辐射为基础的表征技术结合详细的结构,化学和形态学的调查,通过透射和扫描电子显微镜允许元素特定的磁响应和自旋结构之间的定量相关性,一方面和形状,晶体和电子结构的颗粒,另一方面。元素特定的磁滞回线的单个18 nm大小的纳米立方体的测量的例子进行了讨论。用铁磁共振方法研究了不同微波频率下超顺磁系综的磁各向异性及其动态磁响应。这样的调查允许确定的磁弛豫和提取的平均磁各向异性能量密度的单个粒子。
Using size-selected spherical FePt nanoparticles and cubic Fe/Fe-oxide nanoparticles as examples, we discuss the recent progress in the determination of static and dynamic properties of nanomagnets. Synchroton radiation-based characterisation techniques in combination with detailed structural, chemical and morphological investigations by transmission and scanning electron microscopy allow the quantitative correlation between element-specific magnetic response and spin structure on the one hand and shape, crystal and electronic structure of the particles on the other hand. Examples of measurements of element-specific hysteresis loops of single 18 nm sized nanocubes are discussed. Magnetic anisotropy of superparamagnetic ensembles and their dynamic magnetic response are investigated by ferromagnetic resonance as a function of temperature at different microwave frequencies. Such investigations allow the determination of the magnetic relaxation and the extraction of the average magnetic anisotropy energy density of the individual particles.
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