High sensitivity magnetization measurements of nanoscale cobalt clusters

High sensitivity magnetization measurements of nanoscale cobalt clusters
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纳米级钴簇的高灵敏度磁化测量

DOI：
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发表时间：
1995
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影响因子：
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通讯作者：
A. Perex
A. Perex
中科院分区：
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文献类型：
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作者：
W. Wernsdorfer;K. Hasselbach;A. Benoît;B. Barbara;D. Mailly;J. Tuaillon;J. P. Perez;V. Dupuis;J. Dupin;G. Guiraud;A. Perex

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提出了一种新型的高灵敏度磁强计，使我们能够测量大约IO4PB的磁化反转，相当于大约IO-R6EMU的灵敏度。该探测器是一种采用电子束光刻技术制造的Nb微桥直流超导量子干涉器件(Squid)。它可以在O-7K的温度范围内运行。此外，我们还提出了一种在SQUID环上沉积直径约2-5 nm的少量Co团簇的方法。在这些样品上得到的第一个结果表明，团簇之间仍然存在铁磁耦合，并且磁化反转是由小雪崩发生的
Presented is a novel high sensitivity magnetometer allowing us to measure the magnetization reversal of about IO4 pB corresponding to a sensitivity of about IO-r6 emu. The detector is a niobium micro-bridge DC superconducting quantum interference device (SQUID), fabricated using electron-beam lithography. It is operational in the temperature range of O-7 K. Furthermore, we present a method to deposit on the SQUID loop a small number of Co clusters of about 2-5 nm in diameter. The first results obtained on these samples show that there is still a ferromagnetic coupling between the clusters and the magnetization reversal takes place by small avalanches