title: An Ising iron(ii) chain exhibits a large finite-size energy barrier and "hard" magnetic behaviour.
abstract: One-dimensional spin chains featuring strong axial anisotropic magnetism are promising candidates for isolatable and miniatured information storage materials, the so-called single-chain magnets (SCMs). Here we show a mixed azido/carboxylato bridged metamagnetic iron(ii) chain [Fe(N3)2(4-mpc)]n(4-mpc = N-methylpyridinium-4-carboxylate) with a large energy barrier of 150 K, a large remnant magnetization (1.55Nβ) and coercivity (1.7 T at 2 K) for homo-spin SCMs. Heat capacity and Mössbauer spectroscopy studies corroborate the intrinsic nature of SCM behavior regardless of weak interchain magnetic interactions, which lead to the coexistence of metamagnetism but not long-range magnetic ordering. Moreover, detailed magnetic investigations indicate that the system is not only within the "Ising limit" but also in the "finite-size" regime.
authors.affiliation: Frontier Institute of Science and Technology (FIST) and School of Science, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710054, China. zheng.yanzhen@xjtu.edu.cn hantian0123@xjtu.edu.cn.
authors.forename: Yi-Fei
authors.initials: YF
authors.lastname: Deng
authors.affiliation: Frontier Institute of Science and Technology (FIST) and School of Science, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710054, China. zheng.yanzhen@xjtu.edu.cn hantian0123@xjtu.edu.cn.
authors.forename: Tian
authors.initials: T
authors.lastname: Han
authors.affiliation: School of Chemistry & Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Xue
authors.affiliation: Research Institute for Production Development, Shimogamo, Sakyo, Kyoto 606-0805, Japan and Institute for Integrated Cell-Material Sciences, Kyoto University, Sakyo, Kyoto 606-8501, Japan.
authors.forename: Naoaki
authors.initials: N
authors.lastname: Hayashi
authors.affiliation: Department of Energy and Hydrocarbon Chemistry, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan and CREST, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kageyama
authors.affiliation: Frontier Institute of Science and Technology (FIST) and School of Science, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710054, China. zheng.yanzhen@xjtu.edu.cn hantian0123@xjtu.edu.cn.
authors.forename: Yan-Zhen
authors.identifier: http://orcid.org/0000-0003-4056-097X
authors.initials: YZ
authors.lastname: Zheng