2011/03/31 by T. Golod, A. Rydh, V. M. Krasnov
Physics and Astronomy · #Condensed matter physics #Electrical resistivity and conductivity #Hall effect #Magnetic properties of thin films #Materials science #Nanotechnology #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum mechanics #Thin film #cond-mat.mtrl-sci
paper · pdf · doi:10.1063/1.3615959
published as J. Appl. Phys. 110, 033909 (2011) · 12 pages, 17 figures
arxiv created 2011/06/03 · openalex publication_date 2011/08/01 · arxiv updated 2015/03/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We have studied the Hall effect in sputtered NixPt1−x thin films with different Ni concentrations. Temperature, magnetic field, and angular dependencies are analyzed and the phase diagram of NiPt thin films is obtained. It is found that films with sub-critical Ni concentration exhibit cluster-glass behavior at low temperatures with a perpendicular magnetic anisotropy below the freezing temperature. Films with super-critical Ni concentration are ferromagnetic with parallel anisotropy. At the critical concentration the state of the film is strongly frustrated. Such films demonstrate canted magnetization with the easy axis rotating as a function of temperature. The magnetism appears via consecutive paramagnetic–cluster glass–ferromagnetic transitions, rather than a single second-order phase transition. But most remarkably, the extraordinary Hall effect changes sign at the critical concentration. We suggest that this is associated with a reconstruction of the electronic structure of the alloy at the normal metal–ferromagnet quantum phase transition.