Resistance Paints the Secret Angles of a Magnetic Dance ⚡ экспресс
Original: "Unusual dependence on the angle of magnetic field for the spin Hall magnetoresistance of monodomain epitaxial BiFeO3 thin films"
In thin films, a strange shift reveals the hidden behavior of magnetic arrows.
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You turn on a current in a thin magnetic film, and the resistance draws a map of spins. Usually the map is simple, but in this new material it's gone awry—as if a compass points away from north. Such anomalies promise a breakthrough in spintronics.
🎯 Bismuth ferrite is a multiferroic: it combines ferromagnetism and ferroelectricity, working as two materials in one.
\Delta R \propto \cos[2(\alpha - \alpha_0)]
ΔR is the change in resistance, α is the angle between the current and the external field, α₀ is the angle offset, different for different materials.