Pt包覆对Co纳米粒子磁性的调控
Tuning the magnetic properties of Co nanoparticles by Pt capping
摘要：
我们表明，通过帽钴纳米粒子与少量的Pt强烈的变化的磁性可以诱导。Co纳米颗粒的平均直径为2.7 nm。根据磁力测量，我们发现对于零和少量Pt（标称厚度t（Pt）< 0.7 nm），纳米颗粒表现出超顺磁性。随着t（Pt）的增加，阻断温度从16 K提高到108 K。用Pd封端产生相当的结果。当t（Pt）> 1nm时，出现强耦合态，类似于T_c约为0.1nm的铁磁体。400 K
英文摘要：
We show that by capping Co nanoparticles with small amounts of Pt strong changes of the magnetic properties can be induced. The Co nanoparticles have a mean diameter of 2.7 nm. From magnetometry measurements we find that for zero and for small amounts of Pt (nominal thickness t(Pt) < 0.7 nm) the nanoparticles behave superparamagnetic like. With increasing t(Pt) the blocking temperature is enhanced from 16 up to 108 K. Capping with Pd yields comparable results. However, for values t(Pt) > 1 nm a strongly coupled state is encountered resembling a ferromagnet with a T_c approx. 400 K
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