Magnetic anisotropy in 5d transition metal-porphyrin molecules
Yan-Wen Zhang(张岩文)1, Gui-Xian Ge(葛桂贤)1,†, Hai-Bin Sun(孙海斌)2, Jue-Ming Yang(杨觉明)1, Hong-Xia Yan(闫红霞)1, Long Zhou(周龙)1, Jian-Guo Wan(万建国)3, and Guang-Hou Wang(王广厚)3
1 Key Laboratory of Ecophysics and Department of Physics, College of Science, Shihezi University, Shihezi\/ 832003, China; 2 Key Laboratory of Advanced Micro/Nano Functional Materials, Department of Physics and Electronic Engineering, Xinyang Normal University, Xinyang\/ 464000, China; 3 National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing\/ 210093, China
Abstract Single molecule magnets (SMMs) with large magnetic anisotropy energy (MAE) have great potential applications in magnetic recording. Using the first-principles calculations, we investigate the MAE of 5d transition metal-porphyrin-based SMMs by using the PBE and PBE+U with different U values, respectively. The results indicate that W-P, Re-P, Os-P, and Ir-P possess the considerably large MAE among 5d TM-P SMMs. Furthermore, the MAE of 5d TM-P can be facilely manipulated by tensile strain. The reduction of the absolute value of MAE for Ir-P molecule caused by tensile strain makes it easier to implement the writing operation. The decreasing of the occupation number of minority-spin channels of Ir-dx2-y2 orbital leads the MAE to decrease when the tensile strain increases.
(Theory of electronic structure, electronic transitions, and chemical binding)
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 21403144, 11464038, 11134005, and 51472113) and the National Key Project for Basic Research of China (Grant Nos. 2013CB922103 and 2015CB921203).
The 50 nm-thick yttrium iron garnet films with perpendicular magnetic anisotropy Shuyao Chen(陈姝瑶), Yunfei Xie(谢云飞), Yucong Yang(杨玉聪), Dong Gao(高栋), Donghua Liu(刘冬华), Lin Qin(秦林), Wei Yan(严巍), Bi Tan(谭碧), Qiuli Chen(陈秋丽), Tao Gong(龚涛), En Li(李恩), Lei Bi(毕磊), Tao Liu(刘涛), and Longjiang Deng(邓龙江). Chin. Phys. B, 2022, 31(4): 048503.
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
