Large Zero-Field Cooled Exchange-Bias in Bulk<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Mn</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi>PtGa</mml:mi></mml:math>

Nayak, Ajaya K.; Nicklas, M.; Chadov, Stanislav; Shekhar, Chandra; Skourski, Y.; Winterlik, Jürgen; Felser, Claudia

doi:10.1103/physrevlett.110.127204

Cited by 205 publications

(131 citation statements)

References 27 publications

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“…The ZEB effect is believed to be related to the field induced reconfiguration of the spins at the magnetic interfaces that occurs during the initial magnetization of the system [6][7][8][9][10] . Thus in the M (H) curve of a ZEB material the virgin curve usually lies outside the main loop for a certain H interval, and for some critical H the curves intersect 6,7,9 .…”

Section: Exchange Biasmentioning

confidence: 99%

“…Recently, improvements on oxide heterostructures growth have renewed the interest in such compounds, since it opens the real possibility of fabrication of multifunctional devices using strongly correlated electronic materials 5 . Recently, some compounds have been reported to exhibit a spontaneous EB effect, i.e., there is a shift along the field axis on the magnetization as a function of magnetic field measurement [M (H)] even when the system is cooled from an unmagnetized state and without the presence of external magnetic field [6][7][8][9][10] . Despite the different mechanisms claimed to explain this zero field cooled exchange bias (ZEB) effect on distinct materials, two ingredients emerge as responsible for the phenomena: the presence of a glassy magnetic state re-entrant to a conventional magnetism and the reconfiguration of the spins during the initial field application at the M (H) measurement.…”

Section: Introductionmentioning

confidence: 99%

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Training-induced inversion of spontaneous exchange bias field on La1.5Ca0.5CoMnO6

Bufaiçal

Finkler

Coutrim

et al. 2017

Journal of Magnetism and Magnetic Materials

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In this work we report the synthesis and structural, electronic and magnetic properties of La1.5Ca0.5CoMnO6 double-perovskite. This is a re-entrant spin cluster material which exhibits a non-negligible negative exchange bias effect when it is cooled in zero magnetic field from an unmagnetized state down to low temperature. X-ray powder diffraction, X-ray photoelectron spectroscopy and magnetometry results indicate mixed valence state at Co site, leading to competing magnetic phases and uncompensated spins at the magnetic interfaces. We compare the results for this Cadoped material with those reported for the resemblant compound La1.5Sr0.5CoMnO6, and discuss the much smaller spontaneous exchange bias effect observed for the former in terms of its structural and magnetic particularities. For La1.5Ca0.5CoMnO6, when successive magnetization loops are carried, the spontaneous exchange bias field inverts its sign from negative to positive from the first to the second measurement. We discuss this behavior based on the disorder at the magnetic interfaces, related to the presence of a glassy phase. This compound also exhibits a large conventional exchange bias, for which there is no sign inversion of the exchange bias field for consecutive cycles.

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Section: Exchange Biasmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Training-induced inversion of spontaneous exchange bias field on La1.5Ca0.5CoMnO6

Bufaiçal

Finkler

Coutrim

et al. 2017

Journal of Magnetism and Magnetic Materials

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“…2a the host compound Mn 3 Ga has a layered structure, with, along the tetragonal axis, aternating planes formed from Mn-Ga and Mn-Mn. [6][7][8] The (Fig. 2a).…”

Section: Y=ptmentioning

confidence: 99%

Compensated Ferrimagnetic Tetragonal Heusler Thin Films for Antiferromagnetic Spintronics

et al. 2016

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Spintronics is a large field of research that involves the generation, manipulation and detection of spin currents in magnetic heterostructures and the use of these currents to excite and to set the state of magnetic nano-elements. [1,2] The field of spintronics has focused on ferromagnetic thin film structures in which charge currents can be spin-polarized via interfacial and volume spin dependent scattering. However, ferromagnets produce magnetostatic dipole fields, which increase in size as devices are scaled to smaller dimensions. These must be minimized or eleminated to enable operation of spintronic field sensing and magnetic memories. [2] One way to do this is to take advantage of the phenomenon of long-range oscillatory interlayer coupling [3] to create synthetic antiferromagnetic heterostructures [1] or the use of ferrimagnetic materials such as rare-earthtransition metal alloys at their compensation point. [4] The latter ferrimagnetic materials are of special inerest because they can completely eliminate dipole fields volumetrically, even on the atomic scale. However, materials are needed that can operate over a wide temperature window and not solely at or in the vicinity of a compensation temperature. Here we show that Heusler compounds can be designed for this purpose.Heusler compounds, YZ X 2 (where X , Y are transition metals and Z is a main-group 2 element), are well known for their potential applications in spintronics, especially in spin-torque based devices. [5] These materials crystallize in both cubic and tetragonal crystal structures with multiple magnetic sub-lattices, and hence are good candidates for engineering a wide range of complex magnetic structures. In particular all the known tetragonal Heuslers are ferrimagnetic with at least two magnetic sub-lattices whose magnetizations are aligned anti-parallel to one another, or, as has been shown recently, can be non-collinear to one another. The Mn based tetragonal Heuslers are of particular interest because their magnetic ordering temperatures can be well above room temperature, but the magnetizations of their two sub-lattices are typically distinct, leading to a net uncompensated magnetization. One of the most interesting of these materials is Mn3Ga which has a Curie temperature of ~750 K. [6] By tuning the magnetization of the two sublattices in Mn3Ga by changes in composition, we propose that a fully compensated ferrimagnetic (CFI) Heusler is possible. To help identify the needed compositional variations we have carried out density functional calculations of the electronic structures of Mn3-xYxGa   1 0   x (at zero temperature) for the elements = Y Ni, Cu, Rh, Pd, Ag, Ir, Pt, Au, which are non-magnetic or nearly non-magnetic when substituted into Mn3Ga. We show that in all these cases it is theoretically possible to obtain a CFI , which we have experimentally validated for the case of Y=Pt.The present calculation is based on the experimental lattice parameters of the bulk Mn 3 Ga lattice. [6] We find that a compensated mag...

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“…However, the nature magnetic ordering in martensitic phase is not clear. It has been argued that martensitic transformation in such Mn rich alloys leads to change from a ferrimag- netic to an antiferromagnetic state with competing magnetic interactions 30 . In the alloy compositions studied here, a near destruction of magnetic order is observed upon martensitic transformation followed by some kind of magnetic reordering at T austenitic state.…”

Section: Resultsmentioning

confidence: 99%

Magnetic interactions in the martensitic phase of Mn rich Ni-Mn-In shape memory alloys

Lobo

Dwivedi

daSilva

et al. 2013

Journal of Applied Physics

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The magnetic properties of Mn2Ni (1+x) In (1−x) (x = 0.5, 0.6, 0.7) and Mn (2−y) Ni (1.6+y) In0.4 (y = -0.08, -0.04, 0.04, 0.08) shape memory alloys have been studied. Magnetic interactions in the martensitic phase of these alloys are found to be quite similar to those in Ni2Mn (1+x) In (1−x) type alloys. Doping of Ni for In not only induces martensitic instability in Mn2NiIn type alloys but also affects magnetic properties due to a site occupancy disorder. Excess Ni preferentially occupies X sites forcing Mn to the Z sites of X2YZ Heusler composition resulting in a transition from ferromagnetic ground state to a state dominated by ferromagnetic Mn(Y) -Mn(Y) and antiferromagnetic Mn(Y)-Mn(Z) interactions. These changes in magnetic ground state manifest themselves in observation of exchange bias effect even in zero field cooled condition and virgin magnetization curve lying outside the hysteresis loop.

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Large Zero-Field Cooled Exchange-Bias in BulkMn2PtGa

Cited by 205 publications

References 27 publications

Training-induced inversion of spontaneous exchange bias field on La1.5Ca0.5CoMnO6

Training-induced inversion of spontaneous exchange bias field on La1.5Ca0.5CoMnO6

Compensated Ferrimagnetic Tetragonal Heusler Thin Films for Antiferromagnetic Spintronics

Magnetic interactions in the martensitic phase of Mn rich Ni-Mn-In shape memory alloys

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