Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 6, Pages 4109-4117Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b11747
Keywords
segmented nanowires; magnetic interactions; template-assisted electrodeposition; staircase hysteresis loops; nanomagnetism
Funding
- Generalitat de Catalunya [2014-SGR-1015, 2014-SGR-150, 2014-PROD-00059]
- Spanish Ministerio de Economia y Competitividad (MINECO) [MAT2014-57960-C3-1-R, MAT2012-35370, MAT2013-41506, CSD2009-00013]
- FEDER
- MANAQA FET-Open Project from the European Commission [296679]
- ERC CoG SPIN-PORICS [648454]
- China Scholarship Council (CSC)
- MINECO [RYC-2012-10839]
- ICREA Academia - Generalitat de Catalunya
- Severo Ochoa Program (MINECO) [SEV-2013-0295]
- ICREA Funding Source: Custom
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A new strategy to minimize magnetic interactions between nanowires (NWs) dispersed in a fluid is proposed. Such a strategy consists of preparing trisegmented NWs containing two antiparallel ferromagnetic segments with dissimilar coercivity separated by a nonmagnetic spacer. The trisegmented NWs exhibit a staircase-like hysteresis loop with tunable shape that depends on the relative length of the soft- and hard-magnetic segments and the respective values of saturation magnetization. Such NWs are prepared by electrodepositing CoPt/Cu/Ni in a polycarbonate (PC) membrane. The antiparallel alignment is set by applying suitable magnetic fields while the NWs are still embedded in the PC membrane. Analytic calculations are used to demonstrate that the interaction magnetic energy from fully compensated trisegmented NWs with antiparallel alignment is reduced compared to a single-component NW with the same length or the trisegmented NWs with the two ferromagnetic counterparts parallel to each other. The proposed approach is appealing for the use of magnetic NWs in certain biological or catalytic applications where the aggregation of NWs is detrimental for optimized performance.
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