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A novel physical phenomenon has been observed that resembles a large asymmetric switchinglike magnetoresistance at low applied fields in bulk metamagnetic Heusler alloys. A thermally activated isothermal forward metamagnetic transition with a signature of a pronounced time-dependent relaxation was observed in a bulk B-substituted off-stoichiometric Ni-Mn-In Heusler alloy, whereas the reverse metamagnetic transition exhibited the usual athermal behavior with no thermal activation. The asymmetry between the forward and reverse metamagnetic transitions resulted in a large switchinglike, low-field magnetoresistance (∼16% for a field change of B = 0 → 0.25 T at T = 304 K) in the bulk Heusler alloys, Ni50Mn35In15-xBx (1 ≤ x ≤ 2). © 2014 American Physical Society.

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Physical Review B - Condensed Matter and Materials Physics