Cantilever Magnetometry of Individual Ni Nanotubes

Abstract

Recent experimental and theoretical work has focused on ferromagnetic nanotubes due to their potential applications as magnetic sensors or as elements in high-density magnetic memory. The possible presence of magnetic vortex statesstates which produce no stray fields makes these structures particularly promising as storage devices. Here we investigate the behavior of the magnetization states in individual Ni nanotubes by sensitive cantilever magnetometry. Magnetometry measurements are carried out in the three major orientations, revealing the presence of different stable magnetic states. The observed behavior is well-described by a model based on the presence of uniform states at high applied magnetic fields and a circumferential onion state at low applied fields.

Nanoscale multifunctional sensor formed by a Ni nanotube and a scanning Nb nanoSQUID

“…5 compares experimentally obtained min and max for all investigated distances to the simulated ones. From previous work on similar Ni nanotubes, 47 we know that the saturation magnetization is equal within the experimental 20% error to the bulk value known from the literature M s = 408 kA/m (Ref. 50).…”

Stabilized Skyrmion Phase Detected in MnSi Nanowires by Dynamic Cantilever Magnetometry

“…This behavior corresponds to M tilting in the direction of H. The sharp change in the slope of Δf around |H| = 0.4 T reflects the coincidence of M with H and marks the transition from the conical to the field-polarized ferromagnetic state. 24 The subsequent gradual decrease in Δf to more negative values results from the gradual increase of M along H as it approaches saturation. The diagram in the inset to Figure 5a schematically shows the progression of the net magnetization M inferred from Δf(H) in NW3.…”

Reversal Mechanism of an Individual Ni Nanotube Simultaneously Studied by Torque and SQUID Magnetometry

“…1(a)], through which we measure È. Atomic layer deposition of Ni is used to prepare the nanotube around a GaAs nanowire template grown by molecular beam epitaxy [24,25]. The GaAs core supports the structure, making it mechanically robust.…”