Journal of Low Temperature Physics

, Volume 187, Issue 5–6, pp 699–704 | Cite as

Effects of Grain Size on the Magnetic Properties in Bulk and Powder \(\hbox {LaMn}_{0.95}\hbox {Cu}_{0.05}\hbox {O}_{3}\) Perovskite

  • Tian Gao
  • Mei Wu
  • Ningning Qi
  • Chao Sun
  • Yongsheng Liu


We studied the effects of grain size on the magnetic property in the B-site dilute doped \(\hbox {LaMn}_{0.95}\hbox {Cu}_{0.05}\hbox {O}_{3}\) (LMCO) bulk and powder materials, which were prepared by the traditional solid-state reaction and ball-milling process, respectively. XRD patterns show that a single phase of orthorhombic perovskite structure is formed. A sharp paramagnetic-ferromagnetic (PM-FM) transition is detected at its Curie temperature \(T_{\mathrm{C}}\sim 157\,\hbox {K}\). For LMCO bulk samples, the grain size is at \({\sim }10\,{\upmu }\hbox {m}\) proven by SEM observation, and the saturation magnetization \((M_{\mathrm{s}})\) is measured to be \(3.84\,{\upmu }_{\mathrm{B}}\) per formula unit \(({\upmu }_{\mathrm{B}}\hbox {/f.u.})\). However, the long-range magnetic ordering of \(\hbox {e}_{\mathrm{g}}\) electrons below \(T_{\mathrm{C}}\) is weakened by milling the bulk material into nano-size particles. The magnetization decreases with milling time increasing, as well as the particle size. The particle size is observed to be \({<}0.30\) and \({<}0.20\,{\upmu }\hbox {m}\) for 12 and 18 h ball-milled powders, the corresponding \(M_{\mathrm{s}}\) is detected to be 2.23 and \(1.48\,{\upmu }_{\mathrm{B}}\hbox {/f.u.,}\) respectively.


Manganites Magnetization curves Hysteresis loops 



This work is supported by the National Natural Science Foundation of China (Nos. 11204171, 11374204), the Shanghai Municipal Natural Science Foundation (No.16ZR1413600), and “Electrical Engineering” Shanghai class II Plateau Discipline.


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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  • Tian Gao
    • 1
  • Mei Wu
    • 1
  • Ningning Qi
    • 1
  • Chao Sun
    • 1
  • Yongsheng Liu
    • 1
  1. 1.Department of PhysicsShanghai University of Electric PowerShanghaiChina

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