Design of magnetic spirals in layered perovskites: extending the stability range far beyond room temperature

Abstract

In insulating materials with ordered magnetic spiral phases, ferroelectricity can emerge due to the breaking of inversion symmetry. This property is of both fundamental and practical interest, in particular with a view to exploiting it in low-power electronic devices. Advances towards technological applications have been hindered, however, by the relatively low ordering temperatures $T_{\mathrm{spiral}}$ of most magnetic spiral phases, which rarely exceed 100 K. We have recently established that the ordering temperature of a magnetic spiral can be increased up to 310 K by the introduction of chemical disorder. Here we explore the design space opened up by this novel mechanism by combining it with a targeted lattice control of some magnetic interactions. In Cu-Fe layered perovskites we obtain $T_{\mathrm{spiral}}$ values close to 400 K, comfortably far from room temperature and almost 100 K higher than using chemical disorder alone. Moreover, we reveal a linear, universal relationship between the spiral's wave vector and the onset temperature of the spiral phase. This linear law ends at a paramagnetic-collinear-spiral triple point, which defines the highest spiral ordering temperature that can be achieved in this class of materials. Based on these findings, we propose a general set of rules for designing magnetic spirals in layered perovskites using external pressure, chemical substitutions and/or epitaxial strain, which should guide future efforts to engineer magnetic spiral phases with ordering temperatures suitable for technological applications.

arXiv comment5 figures, 35 pages, to be appeared on Science Advance

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Cited by in corpus (10)

• Chirality-driven ferroelectricity in LiCuVO${}_4$
• Tuning the tilting of the spiral plane by Mn doping in YBaCuFeO5 multiferroic
• Spiral order from orientationally correlated random bonds in classical XY models
• Effect of (Cu/Fe)O5 bipyramid size and separation on magnetic and dielectric properties of rare earth layered perovskite LaBaCuFeO5 and LuBaCuFeO5
• Magnetic properties of a highly ordered single crystal of the layered perovskite YBaCuFe${}_{0.95}$Mn${}_{0.05}$O${}_5$
• Influence of the Magnetic Sub-Lattices in the Double Perovskite Compound LaCaNiReO${}_6$
• Weak ferromagnetism linked to the high-temperature spiral phase of YBaCuFeO5
• Effect of doping of Co, Ni and Ga on magnetic and dielectric properties of layered perovskite multiferroic YBaCuFeO5
• Orbitally driven spin reorientation in Mn doped YBaCuFeO${}_5$
• Room-temperature structural phase transition in the quasi-2D spin-1/2 Heisenberg antiferromagnet Cu(pz)${}_2$(ClO${}_4$)${}_2$