Remanence enhancement for stray field-based applications in arrays of crystalline nanomagnets



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Gómez Gutiérrez, Alicia and González Herrera, Elvira María and Vicent López, José Luis and Cebollada Barata, Federico A. and Palomares Simón, Francisco Javier and Sánchez Agudo, Marta and Urdiroz Urricelqui, Unai (2019) Remanence enhancement for stray field-based applications in arrays of crystalline nanomagnets. Journal of physics D, aplied physics, 52 (9). ISSN 0022-3727

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With the aim of achieving stable, substantial remanences adequate for exploitation in stray field-based applications, we report on the hysteresis behavior occurring in arrays of single-crystal Fe motifs, a-beam lithographed into prisms with triangular bases and different orientations of their magnetocrystalline axes with respect to the morphological symmetry axes. From both experimental and simulational analyses we recognize the fact that the magnetization reversal processes of our samples were mediated by motif-sized vortices. Their nucleation and annihilation fields and sites within the motifs, and their field-induced displacements, are discussed in terms of the magnetocrystalline and configurational anisotropies and inter-motif dipolar interactions. From our data, we conclude that reduced remanences as large as 0.85 (sufficient for the application requirements), protected by nucleation fields of several tens of Oe, can be produced in arrays where magnetocrystalline easy axes reinforce and partly compensate the easiest and hardest configurational ones, respectively. The angular dependence of the reduced remanence associated with interplay of these anisotropies corresponds to a symmetry reduction from the triaxial one linked to the triangular morphology down to an effective uniaxial one. We also identify, for the particular case of inter-nanoprism distances that are short in comparison with the dimensions of the motif base, a contribution to the remanence enhancement originating from the dipolar interactions.

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©2019 IOP Publishing
F C, F J P, M S A, U U and J M G would like to acknowledge the Spanish Ministry of Economy and Competitiveness Grant Nos. MAT2013-47878-C2-1-R, MAT2013-47878-C2-2-R and MAT2016-80394-R. A G, E M G and J L V are grateful for support from Spanish Ministry of Economy and Competitiveness Grant No. FIS2016-76058-C4-1-R (AEI/FEDER, EU) and Comunidad de Madrid Grant No. P2013/MIT-2850. IMDEA Nanociencia acknowledges support from the 'Severo Ochoa' Program for Centers of Excellence in R&D (MINECO, Grant SEV-2016-0686).

Uncontrolled Keywords:Anisotropy; Shape; Nanomagnets; Remanence enhancement; Configurational anisotropy; Magnetocrystalline anisotropy; Dipolar interactions
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:51134
Deposited On:12 Feb 2019 14:55
Last Modified:27 Feb 2020 00:01

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