Magnetic-field-induced changes in superparamagnetic cluster dynamics in the martensitic phase of Ni 43 Co 7 Mn 40 Sn 10

P. L. Kuhns, M. J R Hoch, S. Yuan, A. P. Reyes, V. Srivastava, R. D. James, C. Leighton

Research output: Contribution to journalArticle

Abstract

The off-stoichiometric Heusler alloys, such as Ni 50 Mn 25+y X 25-y (X = Sn, In, Ga, etc.), have been extensively investigated using a variety of experimental techniques to probe their interesting and potentially useful magnetic properties. Recent 55 Mn nuclear magnetic resonance (NMR) experiments, carried out largely in zero field (ZF) and making use of the large internal hyperfine field at the nuclear sites, have demonstrated the power of this approach in determining the ground state magnetic characteristics of these materials. In particular, the results reveal that distinct nanoscale ferromagnetic and antiferromagnetic phases coexist. A key parameter used in interpreting the NMR data is the transverse relaxation time T 2 which, inter alia, determines the NMR blocking temperature TBNMR of magnetic regions. The present experiments on a polycrystalline sample of a specific illustrative alloy, Ni 43 Co 7 Mn 40 Sn 10 , which has received considerable attention, show that the application of relatively small external fields, comparable to or greater than the local anisotropy field in the ferromagnetic cluster regions, produces dramatic changes in T 2 and hence TBNMR. The experimental findings are discussed using an extended version of a recently proposed nanocluster model for superparamagnetic systems. It is demonstrated that the field and temperature induced changes in T 2 provide a significant test of the model and lead to a notable advance in applying the NMR technique to the investigation of the magnetic properties of this type of alloy.

Original languageEnglish (US)
Article number252403
JournalApplied Physics Letters
Volume108
Issue number25
DOIs
StatePublished - Jun 20 2016

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nuclear magnetic resonance
magnetic fields
magnetic properties
nanoclusters
relaxation time
anisotropy
ground state
temperature
probes

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Magnetic-field-induced changes in superparamagnetic cluster dynamics in the martensitic phase of Ni 43 Co 7 Mn 40 Sn 10 . / Kuhns, P. L.; Hoch, M. J R; Yuan, S.; Reyes, A. P.; Srivastava, V.; James, R. D.; Leighton, C.

In: Applied Physics Letters, Vol. 108, No. 25, 252403, 20.06.2016.

Research output: Contribution to journalArticle

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AU - Yuan, S.

AU - Reyes, A. P.

AU - Srivastava, V.

AU - James, R. D.

AU - Leighton, C.

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