TY - GEN
T1 - Monte Carlo simulation on the magnetization rotation near magnetic morphotropic phase boundary
AU - Wei, Songrui
AU - Song, Xiaoping
AU - Yang, Sen
AU - Deng, Junkai
AU - Wang, Yu
PY - 2012
Y1 - 2012
N2 - For several decades, morphotropic phase boundary (MPB) in ferroelectric materials has attracted constant interest due to its great enhancement of piezoelectric properties. However, such a MPB has been studied merely in ferroelectric system, not in ferromagnetic system. Recently, we reported the magnetic MPB in a ferromagnetic system of TbCo2-DyCo2 and correspondingly a larger magnetostriction (i.e. a piezoelectricity-like phenomenon in ferromagnets) occurs near MPB. Very surprisingly, such a MPB in TbCo2-DyCo2 system has been ever regarded as a spin reorientation transition (SRT) where the spontaneous magnetization (Ms) gradually rotates from 〈111〉 in TbCo2-rich phase to <001> of DyCo2-rich phase and vice versa. But, our experiment of synchrotron x-ray diffractometry demonstrates the MPB region is the coexistence of TbCo2 and DyCo2 phases and hence the Ms cannot rotate gradually from 〈111〉 to 〈001〉1. Thus, the process of magnetization rotation near MPB in a ferromagnetic system of TbCo2-DyCo2 remains obscure due to a lack of in-situ observation of magnetic moment rotation. In the present work, by using a method of Monte Carlo simulation, we successfully reproduce the observed effects and furthermore clarify the magnetization rotation process near the magnetic MPB of TbCo2-DyCo2 systems. Namely, the direction of magnetization changes discontinuously from 〈111〉 to <001> near the MPB via the phase transition process from TbCo2-rich phase to DyCo2-rich phase. Our simulation provides an effective way to understand the origin of the magnetic MPB.
AB - For several decades, morphotropic phase boundary (MPB) in ferroelectric materials has attracted constant interest due to its great enhancement of piezoelectric properties. However, such a MPB has been studied merely in ferroelectric system, not in ferromagnetic system. Recently, we reported the magnetic MPB in a ferromagnetic system of TbCo2-DyCo2 and correspondingly a larger magnetostriction (i.e. a piezoelectricity-like phenomenon in ferromagnets) occurs near MPB. Very surprisingly, such a MPB in TbCo2-DyCo2 system has been ever regarded as a spin reorientation transition (SRT) where the spontaneous magnetization (Ms) gradually rotates from 〈111〉 in TbCo2-rich phase to <001> of DyCo2-rich phase and vice versa. But, our experiment of synchrotron x-ray diffractometry demonstrates the MPB region is the coexistence of TbCo2 and DyCo2 phases and hence the Ms cannot rotate gradually from 〈111〉 to 〈001〉1. Thus, the process of magnetization rotation near MPB in a ferromagnetic system of TbCo2-DyCo2 remains obscure due to a lack of in-situ observation of magnetic moment rotation. In the present work, by using a method of Monte Carlo simulation, we successfully reproduce the observed effects and furthermore clarify the magnetization rotation process near the magnetic MPB of TbCo2-DyCo2 systems. Namely, the direction of magnetization changes discontinuously from 〈111〉 to <001> near the MPB via the phase transition process from TbCo2-rich phase to DyCo2-rich phase. Our simulation provides an effective way to understand the origin of the magnetic MPB.
KW - Monte Carlo simulation
KW - Morphotropic phase boundary (MPB)
KW - TbCo-DyCo alloys
KW - magnetization rotation
KW - magnetostriction
KW - spin reorientation transition (SRT)
UR - https://www.scopus.com/pages/publications/84874859374
U2 - 10.1117/12.924030
DO - 10.1117/12.924030
M3 - 会议稿件
AN - SCOPUS:84874859374
SN - 9780819490872
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Third International Conference on Smart Materials and Nanotechnology in Engineering
T2 - 3rd International Conference on Smart Materials and Nanotechnology in Engineering
Y2 - 5 December 2011 through 8 December 2011
ER -