Mechanical properties of macroscopic magnetocrystals

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:479

Article

Hidalgo-Caballero, S.^1,2  Escobar-Ortega, Y. Y.^1,2  Becerra-Deana, R. I.^1,2  Salazar, J. M.³  Pacheco-Vazquez, F.¹ 

[1] Benemerita Univ Autonoma Puebla, Inst Fis, Apartado Postal J-48, Puebla 72570, Mexico

[2] Benemerita Univ Autonoma Puebla, Fac Ciencias Fis Matemat, Apartado Postal 1152, Puebla 72000, Mexico

[3] Univ Bourgogne Franche Comte, Lab Interdisciplinaire Carnot Bourgogne ICB, CNRS, UMR 6303, F-21078 Dijon, France

关键词: Fracture;    Failure;    Magnetic crystals;    Mechanical response;    Torsional strength;    Bending;    Tensile strength;    Deformation;   

DOI  :  10.1016/j.jmmm.2019.02.031

来源: Elsevier

【 摘 要 】

We studied experimentally and by numerical simulations the mechanical response of arrays of macroscopic magnetic spheres when an external stress is applied. First, the tensile strength of single chains and ribbons was analyzed. Then, simple cubic (cP), hexagonal (Hx) and hybrid (cP-Hx) structures, called here magnetocrystals, were assembled and subjected to tensile stress, bending stress and torsion until failure was reached. Atomistic crystalline structures are isotropic, but in the case of magnetocrystals, even when geometric isotropy is obeyed, dipolar magnetic interactions introduce a physical anisotropy which modifies, in a non-usual manner, the structures response to the kind of external stress applied. For instance, cP and Hx magnetocrystals subjected to tension exhibit a behavior akin to a brittle and ductile failure, respectively, but under bending the cP structure becomes ductile while the hexagonal lattice becomes brittle. For the hybrid structure, its elastic response and strength are enhanced or reduced depending on which crystallographic direction the stress is applied. These properties, so far unexplored, give to crystalline magnetic arrays a potential interest in the design of metama-terials.

【 授权许可】

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