Magnetic properties resulting from core-shell interactions in nanosized Ni_(0.25)Co_(0.25)Zn_(0.5)Fe_2O_4

N. Lakshmi; Hina Bhargava; O. P. Suwalka; K. Venugopalan; Varkey Sebastian; V. R. Reddy; Ajay Gupta

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Magnetic properties resulting from core-shell interactions in nanosized Ni_(0.25)Co_(0.25)Zn_(0.5)Fe_2O_4

机译：纳米Ni_（0.25）Co_（0.25）Zn_（0.5）Fe_2O_4中核-壳相互作用产生的磁性

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Nanosized particles of Ni_(0.25)Co_(0.25)Zn_(0.5)Fe_2O_4 have been synthesized by chemical coprecipitation method. Exchange-bias phenomenon arising from the core-shell interaction has been investigated using a combination of in-field, low-temperature Mossbauer spectroscopy and dc magnetization. To understand the clear mechanism of interaction and exchange bias, isothermal remanence magnetization-dc demagnetization and M-H loops at different cooling field have been taken. The observed variation in coercivity H_C and exchange-bias field H_E confirms that only core is affected by the cooling field. The slope of the Henkel plot is 1.82, indicating the noninteracting nature of the particles. In-field Mossbauer spectroscopy clearly establishes the core and shell contributions and also confirms that 70% of spins are in the shell. The barrier energy has been estimated to be 17 × 10~(14) ergs which accounts for the fact that the shell is not affected by application of as large a field as 5 T.

机译：通过化学共沉淀法合成了Ni_（0.25）Co_（0.25）Zn_（0.5）Fe_2O_4纳米粒子。由核壳相互作用产生的交换偏置现象已通过现场低温Mossbauer光谱学和直流磁化的结合进行了研究。为了理解相互作用和交换偏压的清晰机理，我们采用了在不同冷却场的等温剩磁-直流去磁和M-H回路。观察到的矫顽力H_C和交换偏置场H_E的变化证实，只有铁心受冷却场的影响。汉高图的斜率是1.82，表明粒子的非交互性质。场内Mossbauer光谱清楚地确定了核和壳的贡献，并确认70％的自旋在壳中。势垒能量估计为17×10〜（14）ergs，这说明了这样的事实，即，壳不受5 T那样大的磁场的影响。

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来源
《Physical review》 |2009年第17期|174425.1-174425.6|共6页
作者
N. Lakshmi; Hina Bhargava; O. P. Suwalka; K. Venugopalan; Varkey Sebastian; V. R. Reddy; Ajay Gupta;
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Department of Physics, Mohanlal Sukhadia University, Udaipur, 313 001 Rajasthan, India;

Department of Physics, Mohanlal Sukhadia University, Udaipur, 313 001 Rajasthan, India;

Department of Physics, Mohanlal Sukhadia University, Udaipur, 313 001 Rajasthan, India;

Department of Physics, Mohanlal Sukhadia University, Udaipur, 313 001 Rajasthan, India;

Department of Physics, Nirmalagiri College, Kuthuparamba, Kerala 670701, India;

UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore 452001, India;

UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore 452001, India;

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正文语种 eng
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magnetic properties of nanostructures;

机译：纳米结构的磁性;

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Magnetic properties resulting from core-shell interactions in nanosized Ni_(0.25)Co_(0.25)Zn_(0.5)Fe_2O_4

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