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Reversal of Magnetisation in ising ferromagnet by the Field Having Gradient

Communications in Theoretical Physics 2016年第11期65卷 563-570页

作者： Abyaya Dhar Muktish Acharyya Department of Physics Presidency University

We have studied the reversal of magnetisation in ising ferromagnet by the field having gradient along a particular direction. We employed the Monte Carlo simulation with Metropolis single spin nip algorithm. The average lifetime of the metastable state was observed to increase with the magnitude of the gradient of applied field. In the high gradient regime, the system was observed to show two distinct region of up and down spins. The interface or the domain wall was observed to move as one increases the gradient. The displacement of the mean position of the interface was observed to increase with the gradient as hyperbolic tangent function. The roughness of the interface was observed to decay exponentially as the gradient increases. The number of spin flip per site was observed to show a discontinuity in the vicinity of the domain wall. The amount of the discontinuity was found to diverge with the system size as a power law fashion with an exponent 5/3.

关键词： ising ferromagnet metastable lifetime Monte Carlo simulation metropolis algorithm

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Layer dependence of stacking order in nonencapsulated few-layer CrI3

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Science China Materials 2020年第3期63卷 413-420页

作者： Kai Guo Bowen Deng Zhen Liu Chaofeng Gao Zhongtai Shi Lei Bi Li Zhang Haipeng Lu Peiheng Zhou Linbo Zhang Yingchun Cheng Bo Peng National Engineering Research Center of Electromagnetic Radiation Control Materials School of Electronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 611731China Key Laboratory of Flexible Electronics&Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing Tech UniversityNanjing 211816China Department of Physics Broida HallUniversity of California Santa BarbaraCA 93106-9530USA Key Laboratory of Multi-spectral Absorbing Materials and Structures of Ministry of Education University of Electronic Science and Technology of ChinaChengdu 611731China

Long-range magnetic orders in atomically thin ferromagnetic CrI3 trigger new fascinating physics and application *** physical properties of two-dimensional(2D)ferromagnetism CrI3 are significantly influenced by interlayer spacing and stacking order,which are sensitive to the hydrostatic pressure and external ***,there remains debate on the stacking order at low ***,we study the interlayer coupling and stacking order of non-encapsulated 2–5 layer and bulk CrI3 at 10 K by Raman spectroscopy;demonstrate a rhombohedral stacking in both antiferromagnetic and ferromagnetic *** opposite helicity dependence of Ag and Eg modes arising from phonon symmetry further validates the rhombohedral *** anomalous temperature-dependent behavior is observed due to spin-phonon coupling below 60 *** study provides insights into the interlayer coupling and stacking orders of 2D ferromagnetic materials.

关键词： ferromagnetic 2D materials ising ferromagnet spintronics magneto-optical

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