SUPERPARAMAGNETIC BEHAVIOR OF STRUCTURAL DOMAINS IN EPITAXIAL ULTRATHIN MAGNETITE FILMS
SUPERPARAMAGNETIC BEHAVIOR OF STRUCTURAL DOMAINS IN EPITAXIAL ULTRATHIN MAGNETITE FILMS
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DOI：
10.1103/physrevb.57.r8107
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发表时间：
1998-04
影响因子：
3.7
通讯作者：
F. Voogt;T. Palstra;L. Niesen;O. Rogojanu;M. A. James;T. Hibma
中科院分区：
文献类型：
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作者：
F. Voogt;T. Palstra;L. Niesen;O. Rogojanu;M. A. James;T. Hibma
我们提供的证据表明，在单晶MgO（100）上外延生长的磁铁矿fe3o4薄膜形成具有独特磁性的畴。在反相畴边界处，强180 Fe-O-Fe超交换路径导致畴间相互作用受挫。探针层Mössbauer光谱学显示了整个薄膜的超顺磁性行为，尽管薄膜的逐层生长近乎完美。利用超导量子干涉装置磁强计测定了超顺磁阻塞温度与厚度的关系。
We provide evidence that thin films of magnetite Fe 3 O 4 epitaxially grown on single-crystalline MgO (100), form domains with unique magnetic properties. Strong 180 Fe-O-Fe superexchange paths at antiphase domain boundaries result in a frustration of the interdomain interactions. Probe-layer Mössbauer spectroscopy shows superparamagnetic behavior in the entire film, in spite of the nearly perfect layer-by-layer growth. Superconducting quantum interference device magnetometry is used to determine the temperature and thickness dependence of the superparamagnetic blocking temperatures.