High thermal stability of the ferrimagnetic moment in exchange biased FeO(core)/spinel(shell) nanocubes
High thermal stability of the ferrimagnetic moment in exchange biased FeO(core)/spinel(shell) nanocubes
复制标题
交换偏置 Fe3O(核)/尖晶石(壳)纳米立方体中亚铁磁矩的高热稳定性
DOI：
10.1088/1742-6596/266/1/012127
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
T. Ogawa
中科院分区：
文献类型：
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作者：
H. Hai;H. Kura;M. Takahashi;T. Ogawa
在这里，我们展示了一种新型的交换耦合氧化铁基核/壳纳米立方体的基本方法，该纳米立方体由氧化亚铁(Wusite，FeO)的反铁磁核心和铁氧体(尖晶石，γ-Fe_2O_3或Fe_3O_4)的亚铁磁性(FM)壳组成。通过与AFM磁芯的耦合，FM磁矩的有效阻挡温度被大大提高到AFM磁芯的Néel温度(Tn=198K)。这归因于纳米立方体中AFM和FM组分界面处的交换偏置引起的额外各向异性的贡献。由于这种特殊的耦合结构，即使在AFM相对于FM矩阵的体积分数很小的情况下，也可以获得高稳定性的FM矩，从而显著地消除了AFM对整个耦合系统磁化的贡献，为磁性器件的应用提供了一种新的混合结构。
We demonstrate herein a basic approach to a new type of exchange-coupled iron oxide-based core/shell nanocubes consisting of an antiferromagnetic (AFM) core of ferrous oxide (wustite, FeO) surrounded by a ferrimagnetic (FM) shell of ferrite (spinel, γ-Fe2O3 or Fe3O4). By coupling with AFM core, effective blocking temperature of FM moments is strongly enhanced up to Néel temperature (TN = 198 K) of AFM core. This is assigned to contribution of an extra anisotropy induced by exchange bias at the interface between AFM and FM components in the nanocubes. Because of this special coupling structure, the high stability of FM moments can be achieved even at very small volume fraction of AFM with respect to FM matrix, thus significantly eliminate contribution of AFM to the magnetization of whole coupling system, suggesting a new hybrid structure for magnetic devices applications.
反铁磁薄膜上铁磁纳米粒子的交换偏压
DOI：
--
发表时间：
2007
期刊：
J. Magn. Magn. Mater 310巻2号
影响因子：
--
作者：
Y.Yamamoto;H.Nakagawa;H.Hori
通讯作者：
H.Hori