Preisach analysis of (La0.2Nd0.8)0.67Pb0.33MnO3

• 来源期刊: 中国物理（英文版）
• 关键词: Preisach model hysteresis loop magnetization
• 年，卷（期）: 2005,（5）
• 页码范围: 1051-1054
• 页数: 4页
• 语种: 英文

摘要

The perovskite (La0.2Nd0.8)0.67Pb0.33MnO3 (LNPMO) with a Curie temperature TC=220K is characterized by measuring the zero field cooled (ZFC) and field cooled (FC) moments over a wide range of temperature 2K＜T＜290K in an applied field of Ha=3978.87A/m, and also by the major hysteresis loop over the field range |Ha|≤1061kA/m at T=10K. The data analysed within the framework of a generalized Preisach model, which includes thermal fluctuations,critical effects, and a temperature-dependent distribution of free energy barriers. The analysis shows that the response function of LNPMO is dominated by the growth of the anisotropy barriers.