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arXiv 1302.7231cond-mat.mtrl-sci
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块体材料BiFe0.5Mn 0.5O3的热激活磁化反转

Thermally activated magnetization reversal in bulk BiFe0.5Mn0.5O3

Davide Delmonte, Francesco Mezzadri, Chiara Pernechele, Gianluca Calestani, Gabriele Spina, Marco Lantieri, Massimo Solzi, Riccardo Cabassi, Fulvio Bolzoni, And… 展开作者

Davide Delmonte, Francesco Mezzadri, Chiara Pernechele, Gianluca Calestani, Gabriele Spina, Marco Lantieri, Massimo Solzi, Riccardo Cabassi, Fulvio Bolzoni, Andrea Migliori, Clemens Ritter, Edmondo Gilioli

摘要:

我们报告的BiFe0.5Mn0.5O3,一个潜在的I型多铁性化合物显示温度诱导磁化反转的合成和表征。通过在6 GPa和1100°C下施加流体静压进行的固态反应获得本体样品。晶体结构是高度扭曲的钙钛矿,在B位点上没有阳离子顺序,其中除了TM-O 6八面体的倾斜和旋转的复杂方案之外,还检测到铋离子的大偏心。低于T1 = 420 K的化合物进行了第一次弱铁磁转变有关的富铁团簇的有序。在较低的温度下(低于RT)两个不同的热激活机制叠加,诱导在第一个增强的磁化强度在T2 = 288 K,然后在T3 = 250 K为中心的自发反转过程,最后引起一个负响应。高于1500 Oe的场的应用抑制该过程,产生类似铁磁的行为。SQuID磁力测量和穆斯堡尔谱的互补使用允许解释整体磁行为的非等效相互作用簇之间的未补偿弱竞争耦合,其特征在于不同的临界温度和由此产生的磁化。PACS编号:75.85。+ t,75.60.Jk,76.80。y,75.30.Et,75.30.Kz

英文摘要:

We report on the synthesis and characterization of BiFe0.5Mn0.5O3, a potential type-I multiferroic compound displaying temperature induced magnetization reversal. Bulk samples were obtained by means of solid state reaction carried out under the application of hydrostatic pressure at 6 GPa and 1100°C. The crystal structure is an highly distorted perovskite with no cation order on the B site, where, besides a complex scheme of tilt and rotations of the TM-O6 octahedra, large off-centering of the bismuth ions is detected. Below T1 = 420 K the compound undergoes a first weak ferromagnetic transition related to the ordering of iron rich clusters. At lower temperatures (just below RT) two distinct thermally activated mechanisms are superimposed, inducing at first an enhancement of the magnetization at T2 = 288 K, then a spontaneous reversal process centered at T3 = 250 K, finally giving rise to a negative response. The application of fields higher than 1500 Oe suppresses the process, yielding a ferromagnetic like behaviour. The complementary use of SQuID magnetometry and Mössbauer spectroscopy allowed the interpretation of the overall magnetic behaviour in terms of an uncompensated weak competitive coupling between non-equivalent clusters of interactions characterized by different critical temperatures and resultant magnetizations. PACS numbers: 75.85.+t, 75.60.Jk, 76.80.+y, 75.30.Et, 75.30.Kz

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