Quantitative imaging of magnetic domain walls in thin films using Lorentz and magnetic force microscopies

We show that a type of magnetic domain walls (DWs) can be monitored by anisotropic magnetoresistance (AMR) measurements due to a specific DW volume depending on the DW type in NiFe magnetic wires. A circular DW injection pad is used to generate DWs at a low magnetic field, resulting in reliable DW introduction into magnetic wires. DW pinning is induced by a change of DW energy at an asymmetric single notch. The injection of DW from the circular pad and its pinning at the notch is observed by using AMR and magnetic force microscope (MFM) measurements. A four-point probe AMR measurement allows us to distinguish the DW type in the switching process because DWs are pinned at the single notch, where voltage probes are closely placed around the notch. Two types of AMR behavior are observed in the AMR measurements, which is owing to a change of DW structures. MFM images and micromagnetic simulations are consistent with the AMR results.

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Magnetic domain walls in nanostrips of single-crystalline Fe4N(001) thin films with fourfold in-plane magnetic anisotropy

Journal of Applied Physics ◽

10.1063/1.4989991 ◽

2017 ◽

Vol 121 (24) ◽

pp. 243904 ◽

Cited By ~ 5

Author(s):

Keita Ito ◽

Nicolas Rougemaille ◽

Stefania Pizzini ◽

Syuta Honda ◽

Norio Ota ◽

...

Keyword(s):

Thin Films ◽

Magnetic Anisotropy ◽

Domain Walls ◽

Magnetic Domain ◽

Single Crystalline ◽

Magnetic Domain Walls

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Non-volatile voltage control of magnetization and magnetic domain walls in magnetostrictive epitaxial thin films

Applied Physics Letters ◽

10.1063/1.4745789 ◽

2012 ◽

Vol 101 (7) ◽

pp. 072402 ◽

Cited By ~ 59

Author(s):

D. E. Parkes ◽

S. A. Cavill ◽

A. T. Hindmarch ◽

P. Wadley ◽

F. McGee ◽

...

Keyword(s):

Thin Films ◽

Domain Walls ◽

Magnetic Domain ◽

Voltage Control ◽

Epitaxial Thin Films ◽

Magnetic Domain Walls

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Laser ablated pure non-crystalline Co thin films for inductors for ultra-high frequencies

MRS Proceedings ◽

10.1557/proc-674-t3.2 ◽

2001 ◽

Vol 674 ◽

Cited By ~ 5

Author(s):

V. Madurga ◽

J. Vergara ◽

C. Favieres

Keyword(s):

Thin Films ◽

Domain Walls ◽

Spontaneous Magnetization ◽

Magnetic Domain ◽

Hysteresis Loops ◽

Magnetic Behavior ◽

Soft Magnetic ◽

High Frequencies ◽

Magnetic Domain Walls ◽

Deposited Films

ABSTRACTNon-crystalline Co thin films have been prepared by pulsed laser ablation deposition. From the M-H hysteresis loops measurements, a soft magnetic behavior is observed. Néel type magnetic domain walls are observed in the as-deposited films. The spontaneous magnetization, Ms(T = 300 K), is ≍ 860 emu/cm3. After annealing at 500 oC, Ms(T = 300 K) is ≍ 1460 emu/cm3. The extrapolated to zero K resistance decreases almost two orders of magnitude from the as deposited samples to the crystallized heated at 500 °C ones. A trilayer Co/Cu/Co has shown a real part magnetic susceptibility of 120 at 100 MHz. In the 100 MHz to 1 GHz frequency range, a perpendicular bias magnetic field increased this value up to 270, remaining almost constant for all range.

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Magnetic Force Microscopic Study on Domain-Wall Molecules in NiFe Nano Rings

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.152-153.529 ◽

2009 ◽

Vol 152-153 ◽

pp. 529-532

Author(s):

Kohei Sasage ◽

Naoya Okamoto ◽

Hana Tsujikawa ◽

Takehiro Yamaoka ◽

Eiji Saitoh

Keyword(s):

Magnetic Field ◽

Magnetic Force Microscopy ◽

Magnetic Force ◽

Domain Walls ◽

Magnetic Domain ◽

Threshold Value ◽

Magnetostatic Interaction ◽

Stray Magnetic Field ◽

Force Microscopy ◽

Magnetic Domain Walls

A pair of magnetic domain walls (DWs) in ferromagnetic NiFe rings has been investigated in terms of the magnetic force microscopy (MFM). When the distance between the rings d is greater than a threshold value dth, MFM signals indicate that a DW in the ring is dragged due to a stray magnetic field from an MFM probe tip. When d < dth, this drag signals disappears; DWs are bound to each other by the DW-DW interaction. This transition can be argued in terms of the competition between the DW-DW magnetostatic interaction and the DW-drag potential. From the d-dependent MFM data, the DW-drag potential was estimated.

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