7 research outputs found
Observation of a New Mechanism of Spontaneous Generation of Magnetic Flux in a Superconductor
We report the discovery of a new mechanism of spontaneous generation of a
magnetic flux in a superconductor cooled through . The sign of the
spontaneous flux changes randomly from one cooldown to the next, and follows a
Gaussian distribution. The width of the distribution increases with the size of
the temperature gradient in the sample. Our observations appear inconsistent
with the well known mechanisms of flux generation. The dependence on the
temperature gradient suggests that the flux may be generated through an
instability of the thermoelectric superconducting-normal quasiparticle
counterflow
Antiferromagnetic Switching Driven by the Collective Dynamics of a Coexisting Spin Glass
The theory behind the electrical switching of antiferromagnets is premised on
the existence of a well defined broken symmetry state that can be rotated to
encode information. A spin glass is in many ways the antithesis of this state,
characterized by an ergodic landscape of nearly degenerate magnetic
configurations, choosing to freeze into a distribution of these in a manner
that is seemingly bereft of information. In this study, we show that the
coexistence of spin glass and antiferromagnetic order allows a novel mechanism
to facilitate the switching of the antiferromagnet FeNbS,
which is rooted in the electrically-stimulated collective winding of the spin
glass. The local texture of the spin glass opens an anisotropic channel of
interaction that can be used to rotate the equilibrium orientation of the
antiferromagnetic state. The use of a spin glass' collective dynamics to
electrically manipulate antiferromagnetic spin textures has never been applied
before, opening the field of antiferromagnetic spintronics to many more
material platforms with complex magnetic textures.Comment: 7 pages, 4 Figures, supplement available on reasonable reques
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Antiferromagnetic switching driven by the collective dynamics of a coexisting spin glass.
The theory behind the electrical switching of antiferromagnets is premised on the existence of a well-defined broken symmetry state that can be rotated to encode information. A spin glass is, in many ways, the antithesis of this state, characterized by an ergodic landscape of nearly degenerate magnetic configurations, choosing to freeze into a distribution of these in a manner that is seemingly bereft of information. Here, we show that the coexistence of spin glass and antiferromagnetic order allows a novel mechanism to facilitate the switching of the antiferromagnet Fe1/3 + δNbS2, rooted in the electrically stimulated collective winding of the spin glass. The local texture of the spin glass opens an anisotropic channel of interaction that can be used to rotate the equilibrium orientation of the antiferromagnetic state. Manipulating antiferromagnetic spin textures using a spin glass' collective dynamics opens the field of antiferromagnetic spintronics to new material platforms with complex magnetic textures