High Spatiotemporal Resolution of Magnetic Dynamics in Mn-Ni-Ga via Four-Dimensional Lorentz Microscopy

Zhang, Ming1,2; Li, Zi-An1; Sun, Shuaishuai1; Xu, Peng1; Zhu, Chunhui1; Tian, Huanfang1; Li, Zhongwen1; Zhang, Ying1; Yang, Huaixin1; Li, Jianqi1,2,3

2019-09-18

10.1103/PhysRevApplied.12.034037

Physical Review Applied   影响因子和分区

2331-7019

High spatiotemporal resolution study of magnetic dynamic transitions in (Mn0.5Ni0.5)(65)Ga-35 (hereafter referred to as Mn-Ni-Ga) is carried out using Lorentz ultrafast transmission electron microscopy (UTEM). The Lorentz UTEM images with a subpicosecond temporal and sub-50-nm spatial resolution reveal remarkable features of magnetic transient states after a femtosecond pulsed laser excitation and three successive dynamic processes involving four distinct magnetic states are evidently observed in Mn-Ni-Ga crystals. Moreover, a full reversible dynamic cycle for the photoinduced ferroparamagnetic transition in a time span of up to tens of microseconds is also examined by using nanosecond-laser-generated photoelectrons. The temporal changes of electron, spin, and lattice in the present system are qualitatively analyzed based on a three-temperature approximation. Our Lorentz UTEM observations highlight the feasibility of direct imaging ultrafast demagnetization and relevant dynamic natures in complex spin textures with a nanometer-picosecond spatiotemporal resolution.

SCI ; EI

英语

通讯

SUSTech[Y01236237]

Physics

Physics, Applied

WOS:000486658100003

AMER PHYSICAL SOC

20194007493723

Gallium alloys ; Laser excitation ; Magnetism ; Manganese alloys ; Pulsed lasers ; Ternary alloys ; Textures

Manganese and Alloys:543.2 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Magnetism: Basic Concepts and Phenomena:701.2 ; Optical Devices and Systems:741.3 ; Lasers, General:744.1 ; Laser Applications:744.9

Web of Science

1.Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China
2.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Guangdong, Peoples R China
3.Songshan Lake Mat Lab, Dongguan 523808, Guangdong, Peoples R China

Zhang, Ming,Li, Zi-An,Sun, Shuaishuai,et al. High Spatiotemporal Resolution of Magnetic Dynamics in Mn-Ni-Ga via Four-Dimensional Lorentz Microscopy[J]. Physical Review Applied,2019,12(3).

Zhang, Ming.,Li, Zi-An.,Sun, Shuaishuai.,Xu, Peng.,Zhu, Chunhui.,...&Li, Jianqi.(2019).High Spatiotemporal Resolution of Magnetic Dynamics in Mn-Ni-Ga via Four-Dimensional Lorentz Microscopy.Physical Review Applied,12(3).

Zhang, Ming,et al."High Spatiotemporal Resolution of Magnetic Dynamics in Mn-Ni-Ga via Four-Dimensional Lorentz Microscopy".Physical Review Applied 12.3(2019).