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Article Dans Une Revue Applied Physics Letters Année : 2021

Giant volume magnetostriction in La0.85Ce0.15Fe12B6

L. V. B. Diop
Mehdi Amara
O. Isnard

Résumé

We report the discovery of giant magnetostriction and huge negative thermal expansion (NTE) in the itinerant-electron metamagnetic compound La0.85Ce0.15Fe12B6. This system presents multiple magnetic transformations, antiferromagnetic-ferromagnetic (AFM-FM) and ferromagnetic-paramagnetic (FM-PM), driven by changes in both external field and temperature. The magnetic-field-dependent magnetostriction exhibits irreversible abrupt jumps at T ≤ 5 K, while it evolves smoothly with applied field above 5 K. A giant positive volume magnetostriction of DV/V (20 K, 6 T) = 0.80% is observed across the field-induced first-order AFM-FM metamagnetic transition. It is further revealed that the FM-PM transition is accompanied by a remarkably large NTE with a coefficient of linear thermal expansion alphaL =-34×10-6 K-1 over a temperature window of ΔT ~ 63 K.
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Dates et versions

hal-03325781 , version 1 (25-08-2021)

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L. V. B. Diop, Mehdi Amara, O. Isnard. Giant volume magnetostriction in La0.85Ce0.15Fe12B6. Applied Physics Letters, 2021, 118 (26), pp.262409. ⟨10.1063/5.0056511⟩. ⟨hal-03325781⟩
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