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Origin of the asymmetric exchange bias in BiFeO3/Bi2Fe4O9 nanocomposite

机译：BiFeO3 / Bi2Fe4O9纳米复合材料中不对称交换偏压的起源

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We show from detailed magnetometry across 2-300 K that the BiFeO3-Bi2Fe4O9 nanocomposite offers a unique spin morphology where superspin glass (SSG) and dilute antiferromagnet in a field (DAFF) coexist at the interface between ferromagnetic Bi2Fe4O9 and antiferromagnetic BiFeO3. The coexisting SSG and DAFF combine to form a local spin texture, which gives rise to a path- dependent exchange bias below the spin freezing temperature (similar to 29 K). The exchange bias varies depending on the protocol or path followed in tracing the hysteresis loop. The exchange bias has been observed below the blocking temperature (T-B) 60 K of the superparamagnetic Bi2Fe4O9. The conventional exchange bias (CEB) increases nonmonotonically as temperature decreases. The magnitude of both exchange bias (H-E) and coercivity (H-C) increase with decrease in temperature and are found to be asymmetric below 20 K depending on the path followed in tracing the hysteresis loop and bias field. The local spin texture at the interface between ferromagnetic and antiferromagnetic particles generates a nonswitchable unidirectional anisotropy along the negative direction of the applied field. The influence of this texture also shows up in " asymmetric" jumps in the hysteresis loop at 2 K, which smears off at higher temperature. The role of the interface spin texture in yielding the path dependency of exchange bias is thus clearly delineated.
机译：我们从2-300 K的详细磁力分析表明，BiFeO3-Bi2Fe4O9纳米复合材料提供了独特的自旋形态，其中超旋玻璃（SSG）和稀反铁磁体在磁场中（DAFF）共存于铁磁Bi2Fe4O9与反铁磁BiFeO3之间的界面处。 SSG和DAFF共存，形成局部自旋纹理，在自旋冻结温度（类似于29 K）以下，会引起与路径有关的交换偏差。交换偏差取决于跟踪磁滞回线所遵循的协议或路径。在超顺磁性Bi2Fe4O9的阻断温度（T-B）60 K以下观察到了交换偏压。常规交换偏压（CEB）随着温度降低而非单调增加。交换偏压（H-E）和矫顽力（H-C）的幅度都随温度的降低而增加，并且在追踪磁滞回线和偏压场时所遵循的路径不同，发现它们在20 K以下不对称。铁磁粒子与反铁磁粒子之间的界面处的局部自旋织构沿着施加电场的负方向生成了不可切换的单向各向异性。这种纹理的影响还出现在2 K的磁滞回线中的“非对称”跃迁中，该跃变在较高温度下会消失。因此，清楚地描述了界面自旋纹理在产生交换偏差的路径依赖性中的作用。

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