Exchange bias behavior in Ni–Mn–Sb Heusler alloys

Abstract

The authors report the observation of exchange bias in bulk polycrystalline Ni 50 Mn 25+x Sb 25−x Heusler alloys. Shifts in hysteresis loops of up to 248 Oe were observed in the 5 T field cooled samples. The observed exchange bias behavior in Ni 50 Mn 25+x Sb 25−x is attributed to the coexistence of antiferromagnetic and ferromagnetic exchange interactions in the system. Such behavior is an addition to the multifunctional properties of the Ni 50 Mn 25+x Sb 25−x Heusler alloy system.

Exchange bias and bistable magneto-resistance states in amorphous TbFeCo thin films

“…[15][16] Recently, polycrystalline Heusler compounds Ni-Mn-X (X = Sn, In, Sb) and Mn-Pt-Ga have been reported to show an intrinsic EB at low temperature due to the coexistence of FM and AFM regions. 6,7,17,18 However, ongoing efforts seek to engineer more desirable properties, such as high Néel temperature, large magnetic anisotropy and good chemical and structural tunability. In this work, we present the amorphous rare-earth-transition-metal (RE-TM) thin film as one promising material-base that provides a wide compositional tunability and requires no epitaxial growth.…”

Magnetoresistance and magnetocaloric effect at a structural phase transition from a paramagnetic martensitic state to a paramagnetic austenitic state in Ni50Mn36.5In13.5 Heusler alloys

“…2͑a͒, the ZFC heating and cooling M͑T͒ curves split at T Ϸ 125 K. It is interesting to note that a similar splitting in magnetization curves has also been observed in other systems due to the presence of inhomogeneous magnetic states at low temperature resulting in the exchange bias phenomena. [13][14][15] In order to clarify the magnetic behavior, ZFC magnetization measurements ͓M͑T͔͒ were carried out for applied magnetic fields of H = 0.1 and 1 T. Inverse susceptibility −1 =H/ M curves are shown in Fig. 2͑b͒.…”

Magnetic Field-Induced Reverse Martensitic Transformation and Thermal Transformation Arrest Phenomenon of Ni41Co9Mn39Sb11 Alloy

“…In addition, positive pressure dependence of the Curie temperature has been reported by Kaneko et al [26] and Kanomata et al [25]. Since the reports of the occurrence of the martensitic transformation in the off-stoichiometric composition [1], a large number of investigations have been performed and many interesting physical properties have been reported in Ni-Mn-Sb and Co-substituted Ni-Co-Mn-Sb alloys, such as large magnetoresistance [27,28], a negative magnetocaloric effect [29,30], a metamagnetic shape memory effect [31] and exchange biasing behavior [32,33], similar to properties of other NiMn-based alloys. In order to investigate metamagnetic behavior and magnetic moment of the field-induced parent phase of Ni-Co-Mn-Sb alloy, magnetization experiments up to a static magnetic field of 18 T and a pulsed magnetic field of 40 T were performed.…”