Inverted hysteresis and negative remanence in a homogeneous antiferromagnet

Published on Nov 7, 2018in Physical Review B4.036
路 DOI :10.1103/PHYSREVB.98.180403
L. Opherden8
Estimated H-index: 8
Thomas Bilitewski8
Estimated H-index: 8
+ 7 AuthorsJ. Wosnitza26
Estimated H-index: 26
(TUD: Dresden University of Technology)
Magnetic remanence - found in bar magnets or magnetic storage devices - is probably the oldest and most ubiquitous phenomenon underpinning technological applications of magnetism. It is a macroscopic non-equilibrium phenomenon: a remanent magnetisation appears when a magnetic field is applied to an initially unmagnetised ferromagnet, and then taken away. Here, we present an inverted magnetic hysteresis loop in the pyrochlore compound Nd_2f_2_7 the remanent magnetisation points in a direction opposite to the applied field. This phenomenon is exquisitely tunable as a function of the protocol in field and temperature, and it is reproducible as in a quasi-equilibrium setting. We account for this phenomenon in considerable detail in terms of the properties of non-equilibrium population of domain walls which exhibit a magnetic moment between domains of an ordered antiferromagnetic state which itself has zero net magnetisation. Properties and (non-equilibrium) dynamics of topological defects play an important role in modern spintronics, and our study adds an instance where a uniform field couples selectively to domain walls rather than the bulk.
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