Theoretical study of mutual control mechanism between magnetization and polarization in multiferroic materials

The mutual control mechanism between magnetization and polarization in multiferroic materials is studied. The system contains a ferromagnetic sublattice and a ferroelectric sublattice. To describe the magneto–electric coupling, we propose a linear coupling Hamiltonian between ferromagnetism and ferr...

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Published inChinese physics B Vol. 24; no. 3; pp. 375 - 379
Main Author 刘宇 翟良君 王怀玉
Format Journal Article
LanguageEnglish
Published 01.03.2015
Subjects
Electric fields
Ferroelectric materials
Ferroelectricity
Ferromagnetism
Hysteresis loops
Joining
Magnetization
Mathematical analysis
Polarization
偏振
实验测量
控制
机制
材料
磁化强度
线性耦合
铁电性
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ISSN1674-1056
2058-3834
1741-4199
DOI10.1088/1674-1056/24/3/037510

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Summary:The mutual control mechanism between magnetization and polarization in multiferroic materials is studied. The system contains a ferromagnetic sublattice and a ferroelectric sublattice. To describe the magneto–electric coupling, we propose a linear coupling Hamiltonian between ferromagnetism and ferroelectricity without microscopic derivation. This coupling enables one to retrieve the hysteresis loops measured experimentally. The thermodynamic properties of the system are calculated, such as the temperature dependences of the magnetization, polarization, internal energy and free energy.The ferromagnetic and ferroelectric hysteresis loops driven by either a magnetic or an electric field are calculated, and the magnetic spin and pseudo-spin are always flipped synchronously under the external magnetic and electric field. Our theoretical results are in agreement with the experiments.
Bibliography:multiferroic materials,mutual control mechanism,ferromagnetic and ferroelectric hysteresis loops,Green＇s function
Liu Yu, Zhai Liang-Jun, and Wang Huai-Yu（Department of Physics, Tsinghua University, Beijing 100084, China）
The mutual control mechanism between magnetization and polarization in multiferroic materials is studied. The system contains a ferromagnetic sublattice and a ferroelectric sublattice. To describe the magneto–electric coupling, we propose a linear coupling Hamiltonian between ferromagnetism and ferroelectricity without microscopic derivation. This coupling enables one to retrieve the hysteresis loops measured experimentally. The thermodynamic properties of the system are calculated, such as the temperature dependences of the magnetization, polarization, internal energy and free energy.The ferromagnetic and ferroelectric hysteresis loops driven by either a magnetic or an electric field are calculated, and the magnetic spin and pseudo-spin are always flipped synchronously under the external magnetic and electric field. Our theoretical results are in agreement with the experiments.
11-5639/O4
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/24/3/037510