Inverse freezing and inverse melting are processes where a more symmetric phase is found at lower temperatures than at higher temperatures. Such inverse transitions are very rare1. Here we report the existence of an inverse transition effect in ultrathin Fe films that are magnetized perpendicular to the film plane. The magnetization of these films is not uniform, but instead manifests itself as stripe domains with opposite perpendicular magnetization2,3,4. Predictions relating to the disordering of this striped ground state in the limit of monolayer film thicknesses are controversial. Mean-field arguments5,6,7 predict a continuous reduction of the stripe width when the temperature is increased; other studies8,9,10,11 suggest that topological defects, such as dislocations and disclinations, might penetrate the system and induce geometrical phase transitions. We find, from scanning electron microscopy imaging, that when the temperature is increased, the low-temperature stripe domain structure transforms into a more symmetric, labyrinthine structure. However, at even higher temperatures and before the loss of magnetic order, a re-occurrence of the less symmetric stripe phase is found. Despite the widespread theoretical and experimental work on striped systems, this phase sequence and the microscopic instabilities driving it have not been observed before.
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Greer, A. L. Too hot to melt. Nature 404, 134–135 (2000)
Garel, T. & Doniach, S. Phase transitions with spontaneous modulation—the dipolar Ising ferromagnet. Phys. Rev. B 26, 325–329 (1982)
Seul, M. & Andelman, D. Domain shapes and patterns: the phenomenology of modulated phases. Science 267, 476–483 (1995)
Sornette, D. Undulation instability in stripe domain structures of bubble materials. J. Phys. 48, 151–163 (1987)
Czech, R. & Villain, J. Instability of two-dimensional Ising ferromagnets with dipole interaction. J. Phys. Condens. Matter 1, 619–627 (1989)
Kashuba, A. & Pokrovsky, V. L. Stripe domain structures in a thin ferromagnetic film. Phys. Rev. B 48, 10335–10344 (1993)
Gehring, G. A. & Keskin, M. The temperature dependence of the domain spacing in ultrathin magnetic films. J. Phys. Condens. Matter 5, L581–L585 (1993)
Nelson, D. R. in Fundamental Problems in Statistical Mechanics V (ed. Cohen, E. G. D.) 53–108 (North-Holland, Amsterdam, 1980)
Abanov, Ar., Kalatsky, V., Pokrovsky, V. L. & Saslow, W. M. Phase diagram of ultrathin ferromagnetic films with perpendicular anisotropy. Phys. Rev. B 51, 1023–1038 (1995)
De'Bell, K., MacIsaac, A. B. & Whitehead, J. P. Dipolar effects in magnetic thin films and quasi-two-dimensional systems. Rev. Mod. Phys. 72, 225–257 (2000)
Stoycheva, A. D. & Singer, S. J. Stripe melting in a two-dimensional system with competing interactions. Phys. Rev. Lett. 84, 4657–4660 (2000)
Vaterlaus, A. et al. Two-step disordering of perpendicularly magnetized ultrathin films. Phys. Rev. Lett. 84, 2247–2250 (2000)
Stampanoni, M., Vaterlaus, A., Aeschlimann, M., Meier, F. & Pescia, D. Magnetic properties of thin fcc iron films on Cu(001). J. Appl. Phys. 64, 5321–5324 (1988)
Thomassen, J. et al. Magnetic live surface layers in Fe/Cu(100). Phys. Rev. Lett. 69, 3831–3834 (1992)
Kirilyuk, A., Giergiel, J., Shen, J., Straub, M. & Kirschner, J. Growth of stabilized γ-Fe films and their magnetic properties. Phys. Rev. B 54, 1050–1063 (1996)
Man, K. L., Altman, M. S. & Poppa, H. Spin polarized low energy electron microscopy investigations of magnetic transitions in Fe/Cu(100). Surf. Sci. 480, 163–172 (2001)
Pierce, J. P., Torija, M. A., Shen, J. & Plummer, E. W. Mapping the magnetic phase diagram of metastable fct Fe/Cu(100) using Co atoms. Phys. Rev. B 64, 224409 (2001)
Kivelson, S. A., Fradkin, E. & Emery, V. J. Electronic liquid-crystal phases of a doped Mott insulator. Nature 393, 550–553 (1998)
Seul, M. & Wolfe, R. Evolution of disorder in two-dimensional stripe patterns: Smectic instabilities and dislocation unbinding. Phys. Rev. Lett. 68, 2460–2463 (1992)
Yochelis, A., Hagberg, A., Meron, E., Lin, A. L. & Swinney, H. L. Development of standing-wave labyrinthine patterns. SIAM J. Appl. Dyn. Syst. 1, 236–247 (2002)
Newell, A. C., Passot, T., Bowman, C., Ercolani, N. & Indik, R. Defects are weak and self-dual solutions of the Cross-Newell phase diffusion equation for natural patterns. Physica D 97, 185–205 (1996)
Harrison, C. et al. Mechanism of ordering in striped patterns. Science 290, 1558–1560 (2000)
Pearson, J. E. Complex patterns in a simple system. Science 261, 189–192 (1993)
We thank the Swiss National Foundation and ETH Zurich for financial support.
The authors declare that they have no competing financial interests.
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Portmann, O., Vaterlaus, A. & Pescia, D. An inverse transition of magnetic domain patterns in ultrathin films. Nature 422, 701–704 (2003). https://doi.org/10.1038/nature01538
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