Article
Materials Science, Multidisciplinary
J. W. Gu, S. M. Zhou
Summary: This study demonstrates the antiferromagnetic property of L10 MnPd films and uncovers their unique magnetotransport characteristics.
Article
Materials Science, Multidisciplinary
Jiajun Guo, Xiaonan Zhao, Zhijian Lu, Peng Shi, Yufeng Tian, Yanxue Chen, Shishen Yan, Lihui Bai, Michael Harder
Summary: By manipulating the pinned spins in an Fe/FeO bilayer using a magnetic field at room temperature, we observed the behavior of the pinned magnetic moment through magnetometry. Our experiment showed a linear relationship between the exchange bias field and the pinned magnetic moment, and we provided a quantitative description of the exchange bias effect based on the pinned uncompensated spin density at the interface as a function of the pinned moment.
Article
Engineering, Environmental
Guibai Li
Summary: This research team has been dedicated to the study of Fe/Mn removal and the application of KMnO4 in drinking water purification for over 60 years. They have made several technological innovations, including the use of natural manganese sand as a cost-effective technique for Fe/Mn removal, and the application of KMnO4 for the removal of pollutants in source waters. The studies have led to the development of widely used techniques in drinking water production in China.
Article
Materials Science, Multidisciplinary
Peter K. Greene, Yong Hu, Ziqiang Qiu, Kai Liu
Summary: The emergence of exchange bias and coercivity enhancement in epitaxial CoO/Fe films is investigated, revealing different CoO thickness dependence of the effects. It is found that the AF domain state is metastable and can be reoriented by external and exchange fields prior to the appearance of frozen spins. Monte Carlo simulations show that AF anisotropy energy barrier and rotatable spins induced by magnetic field and exchange interaction account for the observed effects.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Lei Wang, Reza Darvishi Kamachali
Summary: This research utilized a density-based model to calculate multi-component grain boundary phase diagrams and studied the Fe-Mn-Cr, Fe-Mn-Ni, Fe-Mn-Co, Fe-Cr-Ni, and Fe-Cr-Co alloy systems. The study found that despite solute segregation enrichment, a grain boundary may have a lower solubility limit than the bulk, promoting interfacial chemical decomposition.
Article
Materials Science, Multidisciplinary
A. Deltell, Abd El-Moez A. Mohamed, P. Alvarez-Alonso, M. Ipatov, J. P. Andres, J. A. Gonzalez, T. Sanchez, A. Zhukov, M. L. Escoda, J. J. Sunol, R. Lopez Anton
Summary: Fe substitution for Mn in Ni50Mn36-xFexSn14 alloys reduces the characteristic temperatures of the martensitic transformation and the Curie temperature of the austenite phase linearly. The applied magnetic field has a negligible effect on the martensitic transition temperatures.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Physical
Aleksandra Jankowska, Andrzej Kowalczyk, Malgorzata Rutkowska, Marek Michalik, Lucjan Chmielarz
Summary: Mesoporous silica material of MCM-41 type with spherical morphology was modified with copper, iron, or manganese as well as combinations of these metals. The modified samples were characterized for their structure, morphology, surface acidity, transition metal loadings, and reducibility. The catalytic performance of monometallic and bimetallic samples in the selective catalytic reduction of NO with ammonia was tested, and the bimetallic copper-manganese sample showed the best catalytic activity. The synergistic cooperation between manganese and copper species may be attributed to charge relocation, resulting in improved activation of the catalyst for the desired reaction.
Article
Chemistry, Physical
Ki Hoon Kang, A. -Young Lee, Hyun Ae Cha, Jongmoon Jang, Cheol-Woo Ahn, Jong-Jin Choi, Byung-Dong Hahn, Woon-Ha Yoon, Joon-Hwan Choi, Jong -Woo Kim
Summary: This study investigates the properties of MnFe0.95-xNixP0.5-ySi0.5+y alloys prepared by arc melting. The alloys exhibit strong coupling between lattice variation and magnetic transition, which contributes to their large magnetocaloric properties. The transition temperature can be tuned through Fe-Ni substitution, and the amount of expensive P alloy can be reduced by controlling the P/Si ratio. The alloys show a maximum magnetic entropy change in the temperature range from 214 K to 335 K under an applied magnetic field of 2 T. The alloy with a low P/Si ratio demonstrates competitive magnetocaloric properties to other known magnetic refrigeration materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Matteo Rinaldi, Matous Mrovec, Manfred Faehnle, Ralf Drautz
Summary: In this study, the spin-wave stiffness dependence on Si concentration in FeSi magnetic phases was investigated using the KKR-CPA method, where the changes were primarily governed by variations in the electronic structure.
Article
Multidisciplinary Sciences
Yuguang Pu, Duncan Moseley, Zhen He, Krishna Chaitanya Pitike, Michael E. Manley, Jiaqiang Yan, Valentino R. Cooper, Valerie Mitchell, Vanessa K. Peterson, Bernt Johannessen, Raphael P. Hermann, Peng Cao
Summary: Researchers have developed a bottom-up method for synthesizing rocksalt high-entropy oxides (HEOs) containing Mn and Fe. They investigated the crystal structure and random cation-site occupancy of FeO-HEO, showing improved structural robustness and the viability of an oxygen sublattice as a buffer layer. Compositional analysis revealed the valence and spin state of the iron species, and the antiferromagnetic order of FeO-HEO below a transition temperature around 218 K was reported, along with predictions for the phase stability conditions of Mn and Fe-containing HEOs.
Article
Physics, Multidisciplinary
Na Li, Rui Sun, Yan Li, Lei Su, Zi-Zhao Gong, Xiang-Qun Zhang, Wei He, Zhao-Hua Cheng
Summary: This study reveals a significant enhancement of coercivity in Fe/La2-2xSr1+2xMn2O7 (x=0.35, B-LSMO), attributed to the emergence of antiferromagnetic interfacial exchange coupling between Fe and B-LSMO. This sheds new light on tuning magnetic properties at layered oxide interfaces and designing novel spintronic devices.
Article
Chemistry, Physical
Zhu-bai Li, Zhen Zhang, Yuan-zhe Fu, Chao Wang, Lei Wei, Suo Bai
Summary: This work presents a method of preparing composite (Nd,Dy)-Fe-B magnets to enhance coercivity with a slight decrease in remanence. The addition of Dy-Fe-B powders improves the coercivity of sintered magnets. The coexistence of Dy-Fe-B and Nd2Fe14B phases in the magnets leads to an increase in the fluctuation field and a decrease in the domain wall size, resulting in significant improvement in coercivity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Jiang Zou, Lifeng Wang, Juan He, Bo Wu, Quan Xie
Summary: This study prepared magnetic materials with different dopants using ball milling and sintering processes, and investigated their crystal structures, electrical conductivity, and magnetic properties using various testing methods. The results showed that the dopants enhanced the electrical conductivity and magnetic properties of the materials. Additionally, an improvement in permeability was observed for specific doped alloys.
Article
Materials Science, Multidisciplinary
Xiong-Tao Peng, Fang Lin, Liang Chen, Lin Li, Dong-Hui Xu, Jin-Hua Sun
Summary: In this study, we investigate the correlation effects of magnetic impurities influenced by the k-cubic Rashba spin-orbit coupling (SOC) using the variational method and Hirsch-Fye quantum Monte Carlo simulations. We find that even a small cubic Rashba term can significantly modify the band structure and induce a Van Hove singularity, leading to tunable single impurity local moments. The spin-spin correlation between the magnetic impurity and conduction electrons exhibits unique three- or sixfold rotational symmetry due to the triple winding of spins with a 2 pi rotation of k, which distinguishes the cubic Rashba SOC from the normal k-linear Rashba term. Additionally, we observe twisted features in the carrier-mediated Ruderman-Kittel-Kasuya-Yosida interactions between two magnetic impurities, with ferromagnetic diagonal terms dominating at close distances and important off-diagonal terms at long distances.
Review
Chemistry, Inorganic & Nuclear
Lucero Gonzalez-Sebastian, Adan Reyes-Sanchez, David Morales-Morales
Summary: This review summarizes the advancements in homogeneously catalyzed reactions using pincer complexes of manganese, iron, and cobalt. The scope and mechanistic insights of C-C coupling reactions and hydrogenation reactions are described. The combination of inexpensive metals with pincer ligands can lead to the creation of innovative and effective catalysts.
Article
Chemistry, Multidisciplinary
Huihui Li, Qingfeng Zhan, Yiwei Liu, Luping Liu, Huali Yang, Zhenghu Zuo, Tian Shang, Baomin Wang, Run-Wei Li
Article
Physics, Applied
Wenjuan Cheng, Zheng Zhou, Minjie Pan, Huali Yang, Yali Xie, Baomin Wang, Qingfeng Zhan, Run-Wei Li
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2019)
Article
Physics, Multidisciplinary
Yang Li, Yan Li, Qian Liu, Zhe Yuan, Qing-Feng Zhan, Wei He, Hao-Liang Liu, Ke Xia, Wei Yu, Xiang-Qun Zhang, Zhao-Hua Cheng
NEW JOURNAL OF PHYSICS
(2019)
Article
Materials Science, Multidisciplinary
Yali Xie, Qingfeng Zhan, Yong Hu, Xiao Hu, Xiaodan Chi, Chenyu Zhang, Huali Yang, Wenhui Xie, Xiaoyan Zhu, Jianhua Gao, Wenjuan Cheng, Dongmei Jiang, Run-Wei Li
NPG ASIA MATERIALS
(2020)
Article
Physics, Applied
Shiwei Chen, Cuimei Cao, Lvkang Shen, Ming Liu, Changjun Jiang, Qingfeng Zhan, Xuepeng Qiu
Summary: Electrical modulation of spin transport was demonstrated in PMN-PT/LiFe5O8/Pt heterostructures, with significant changes in spin Hall angle and a nonvolatile hysteresis relationship observed. The dominance of D'yakonov-Perel' type spin transport in LiFe5O8/Pt was revealed, and the modulation of Pt's spin Hall angle was primarily attributed to strain coupling induced by ferroelastic domain switching of the ferroelectric PMN-PT substrate. This work paves the way for novel spintronic devices with electrically tunable spin current generation and transport processes.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Condensed Matter
H. Zhang, X. Y. Zhu, Y. Xu, D. J. Gawryluk, W. Xie, S. L. Ju, M. Shi, T. Shiroka, Q. F. Zhan, E. Pomjakushina, T. Shang
Summary: We report on a systematic study of the temperature and magnetic field dependence of the binary compound EuGa4. We observe a giant nonsaturating magnetoresistance at low temperatures and a series of metamagnetic transitions in an applied magnetic field. Additionally, we observe a hump-like anomaly in the Hall resistivity below the critical temperature.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Physics, Condensed Matter
Xiaoyan Zhu, Yang Xu, Cuimei Cao, Tian Shang, Yali Xie, Qingfeng Zhan
Summary: This paper reviews the recent developments in the magnetic and transport properties of heterostructures based on FeRh and Rh, exploring their unique characteristics and potential applications. The research methods and design principles can be extended to the study of phase transitions in other magnetic materials.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Physics, Multidisciplinary
Xinwei Feng, Jing Meng, Xiaoyan Zhu, Kelei Xue, Yali Xie, Dongmei Jiang, Yang Xu, Tian Shang, Yong Hu, Qingfeng Zhan
Summary: We observed a fourfold magnetic anisotropy induced by interfacial exchange coupling in ferromagnetic/antiferromagnetic bilayers, which can be nicely fitted by a phenomenological model. This additional anisotropy is caused by the presence of two types of antiferromagnetic domains, resulting in different effects on the magnetization.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Applied
Chenyu Zhang, Qingfeng Zhan, Yong Hu
Summary: Bilayers of amorphous CoFeB ferromagnet and epitaxially grown IrMn antiferromagnet were simulated to study the angular dependence of magnetization reversal mechanism and exchange bias behavior. It was found that positive and negative exchange-bias field values appear in the antiferromagnetic easy-axis directions, while the transition/return points of the field with zero exchange-bias exist in the antiferromagnetic hard-axis directions. Additionally, the value of the exchange-bias field was well fitted by considering cos3f/sin3f terms with comparable or larger coefficients compared to the first-order terms in the Fourier expansion.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Xinwei Feng, Yangping Wang, Jing Meng, Haoyu Lin, Xiaoyan Zhu, Yali Xie, Dongmei Jiang, Yang Xu, Tian Shang, Qingfeng Zhan
Summary: We report variable in-plane fourfold magnetic anisotropy in epitaxial exchange-biased Fe/IrMn bilayers with different layer thicknesses. The fourfold magnetic anisotropy of the bilayers continuously decreases and even appears negative as the thickness of the Fe layer decreases. As the IrMn thickness increases, the fourfold magnetic anisotropy of the bilayers decreases rapidly from a value close to the intrinsic magnetocrystalline anisotropy of Fe and then gradually reaches saturation. The extrinsic fourfold magnetic anisotropy depends on the amount of the induced uncompensated IrMn spins near the edge of antiferromagnetic domains.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Yangping Wang, Cuimei Cao, Kelei Xue, Qingfeng Zhan
Summary: The effect of the Hf spacer layer on the magnetic damping of Pt/ferromagnet heterostructures was investigated using broadband ferromagnetic resonance. The magnetic damping of Pt/Co is greatly reduced and then slightly enhanced as the thickness of the Hf spacer layer increases, due to the competition of the magnetic proximity effect, anti-damping behavior, and spin-pumping effect at the interface. A 3-nm-thick Hf spacer layer results in a maximum reduction rate of 48.8% for the magnetic damping of Pt/Co samples. The reduction of magnetic damping by the Hf spacer layer was also demonstrated in the heterostructures of Pt/NiFe and Pt/CoFeB, indicating the universal tuning effect of the Hf spacer layer on the magnetic damping of Pt/FM systems.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Chenyu Zhang, Yali Xie, Qingfeng Zhan, Yong Hu
Summary: Coercivity in an amorphous CoFeB layer becomes anisotropic with fourfold symmetry when exchange coupled with an FeRh layer. The angular dependence of coercivity coincides with the FeRh layer's in-plane easy-axis direction and shifts with FeRh's metamagnetic phase transition. This imprinting phenomenon is applicable for uniaxial magnetocrystalline anisotropy and provides a powerful tool to probe hidden magnetic structures and weakly magnetic materials.
Article
Physics, Applied
Pravarthana Dhanapal, Shanshan Guo, Baomin Wang, Huali Yang, Sandeep Agarwal, Qingfeng Zhan, Run-Wei Li
APPLIED PHYSICS LETTERS
(2017)
Article
Physics, Applied
Xingcheng Wen, Baomin Wang, Ping Sheng, Shuai Hu, Huali Yang, Ke Pei, Qingfeng Zhan, Weixing Xia, Hui Xu, Run-Wei Li
APPLIED PHYSICS LETTERS
(2017)
Article
Physics, Applied
Xinyu Qiao, Xingcheng Wen, Baomin Wang, Yuhao Bai, Qingfeng Zhan, Xiaohong Xu, Run-Wei Li
APPLIED PHYSICS LETTERS
(2017)
