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Novel CoFeAlMn high-entropy alloys with excellentsoft magnetic properties and high thermal stability

Journal of Materials Science & Technology 2023年第22期153卷 22-31页

作者： Wei Gao Yaqiang Dong Xingjie Jia Liping Yang Xubin Li Shouding Wu Ronglin Zhao Hang Wu Qiang Li Aina He Jiawei Li Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology CAS Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology&EngineeringChinese Academy of SciencesNingbo 315201China School of Physical and Technology Xinjiang UniversityUrumqiXinjiang 830000China University of Chinese Academy of Sciences Beijing 100049China

high-entropy alloys(HEAs),which are composed of 3d transition metals such as Fe,Co,and Ni,exhibit an exceptional combination of magnetic and other properties;however,the addition of non-ferromagnetic elements always negatively affects the saturation magnetization strength(M s).Co_(4)Fe_(2)Al_(x)Mn_(y) alloys were designed and investigated in this study to develop a novel HEA with excellent soft magnetic *** Co_(4)Fe_(2)Al_(1.5)Mn_(1.5) HEA possesses the highest M s of 161.3 emu g^(-1) thus far reported for magnetic HEAs,a low coercivity of 1.9 Oe,a high electrical resistivity of 173μΩ cm,a superior thermal stability up to 600℃,which originates from the novel microstructure of B2 nanoparticles distributed in a DO_(3) matrix phase,and the crucial transition of Mn from antiferromagnetism to ferromagnetism with the assistance of *** Co_(4)Fe_(2_)Al_(1.5)Mn_(1.5) HEA was selected to produce micron-sized powder and soft magnetic powder cores(SMPCs)for application in the exploration *** SMPCs exhibit a high stable effective perme-ability of 35.9 up to 1 MHz,low core loss of 38.1 mW cm^(-3)(@100 kHz,20 mT),and an excellent direct current(DC)bias performance of 87.7%at 100 *** study paves the way for the development of soft magnetic HEAs with promising applications as magnetic functional materials.

关键词： high-entropy alloys Soft magnetic powder cores Magnetic properties high saturation magnetization Magnetic domain

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Studies on high-moment soft magnetic FeCo/Co thin films

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Chinese Physics B 2006年第6期15卷 1351-1355页

作者：付煜杨正松本光功刘小晰森迫昭光 Institute of Magnetic Materials Lanzhou University Lanzhou Louzhou 730000 China Department of Information Engineering Shinshu University Nagano 380-8553 Japan

The dependences of soft magnetic properties and microstructures of the sputtered FeCo （=Fe65Co35） films on Co underlayer thickness tCo, FeCo thickness tFeCo, substrate temperature Ts and taxget-substrate spacing dT-s are studied. FeCo single layer generally shows a high coercivity with no obvious magnetic anisotropy. Excellent soft magnetic properties with saturation magnetization μ0Ms of 2.35 T and hard axis coercivity Hch of 0.25 kA/m in FeCo films can be achieved by introducing a Co underlayer. It is shown that sandwiching a Co underlayer causes a change in orientation and reduction in grain size from 70 nm to about 10 nm in the FeCo layer. The magnetic softness can be explained by the Hoffmann＇s ripple theory due to the effect of grain size. The magnetic anisotropy can be controlled by changing dT-S, and a maximum of 14.3 kA/m for anisotropic field Hk is obtained with dT-S=18.0 cm.

关键词： FeCo film sputtering conditions high saturation magnetization soft magnetic properties

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Study on the Rolling Process of 1J22 Soft Magnetic Alloy

Study on the Rolling Process of 1J22 Soft Magnetic Alloy

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中国材料大会2012

作者： Chao Gan Jie Zhu State Key Laboratory For Advanced Metals And Materials University of Science and Technology Beijing

ISBN: (纸本)9783037856079;3037856076

The nearly stoichiometric Fe-Co alloy is well known as soft magnetic materials with high saturation magnetization and Curie temperature. However, the application is restricted by its brittleness and poor machinability. For this reason, we studied the rolling process of this alloy. Firstly, the effect of final thickness of hot rolling on the cold rolled samples showed that there was little difference for these cold rolled samples, and the thinner hot rolling samples were not so easy to crack during the cold rolling. Secondly, the soft magnetic properties were found to be better under the 1050℃ water quench when we studied the influence of different solution temperature on soft magnetic properties. Thirdly, with the increase of annealing time, grain size and soft magnetic properties of 1J22 alloy increased, whereas mechanical properties decreased.

关键词： 1J22 alloy Rolling process high saturation magnetization Heat treatment

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Structural analysis and magnetic properties of chemically synthesized composition-controlled Fe1-xCox particles

Structural analysis and magnetic properties of chemically sy...

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2015中国功能新材料学术论坛暨第四届全国电磁材料及器件学术会议

作者： Xiaopan Li Bai Yang Xueying Yang Ying Cao Ronghai Yu School of Materials Science and Engineering Beihang University

The composition-controlled micron-sized FeCo(0.2high purity have been prepared by a direct reduction *** influence of Co content on phase formation,crystal structures and magnetic properties of the products have been systematically *** shows a ultimate mutual solubility of Fe element entering in bcc-FeCo solid solution and while a limited dissolution of Co distributed in the bcc-FeCo lattices for the chemically synthesized large-grain FeCo *** as-synthesized FeCo alloy particles with x high density of 7.2-7.6 g/cm3 can be obtained by compacting these chemically synthesized FeCo particles via conventional powder compaction *** well-alloyed FeCo particles exhibit good intrinsic magnetic properties with high saturation magnetization of 182-220 Am/kg due to their high purity and single bcc-FeCo phase.

关键词： structural analysis composition-controlled Fe1-xCox particles good compactibility high saturation magnetization

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