Racetrack memory stores digital data in the magnetic domain walls of nanowires. This technology promises to yield information storage devices with high reliability, performance and capacity. But magnetic domain walls (in nanowires) appears near pinning sites or in wires if wires have shape anisotropy (like U sahpe, L shape, ring shape etc). So far I did not see any paper that shows domain wall in wires without pinning sites. Can anyone please help me to understand, why it is not possible to see magnetic domain wall in very straight nanowries (without pinning sites)? Or how it could be possible to see domain wall in straight wires? May be there are some references that show domain wall in straight wires, if someone knows please share.
S.P. Parkin-Vol 443|14 September 2006|doi:10.1038/nature05093
S.P. Parkin-SCIENCE VOL 320 11 APRIL 2008
Domain structure in nanowires is quite common, see the articles below:
JOURNAL OF APPLIED PHYSICS 117, 043904 (2015) Giant magnetoimpedance effect and domain wall dynamics in Co-rich amorphous microwires
APPLIED PHYSICS LETTERS 102, 202406 (2013) Circular domains nucleation in magnetic microwires
Journal of Alloys and Compounds 632 (2015) 520--527 Transformation of magnetic structure in amorphous microwires induced by temperature and high frequency magnetic field
Physica B 435 (2014) 125--128 Experimental demonstration of basic mechanisms of magnetization reversal in magnetic microwires
APPLIED PHYSICS LETTERS 109, 052405 (2016) Control of the domain wall motion in cylindrical magnetic wires
PHYSICAL REVIEW B 82, 212401 (2010) Magnetization switching in ferromagnetic microwires
IEEE TRANSACTIONS ON MAGNETICS, VOL. 48, NO. 11, NOVEMBER 2012, p. 3800-3802 High-Frequency Electric Current Influence on Magnetization Reversal and Domain Structure in Co-Rich Amorphous Microwires
IEEE TRANSACTIONS ON MAGNETICS, VOL. 51, NO. 11, NOVEMBER 2015 2002304 Multidomain Structures in Magnetic Microwires
IEEE TRANSACTIONS ON MAGNETICS, VOL. 50, NO. 11, NOVEMBER 2014, 2005903 Manipulation of Magnetic Domain Structures With Helical Magnetization in Magnetic Microwires
IEEE TRANSACTIONS ON MAGNETICS, VOL. 45, NO. 10, OCTOBER 2009, p. 4279 Kerr Microscopy Study of Magnetic Domain Structure Changes in Amorphous Microwires
Journal of Alloys and Compounds 615 (2014) S304--S307 Transformation of magnetic domain structure in Co- and Fe-rich amorphous microwires
Journal of Magnetism and Magnetic Materials 422 (2017) 299-303 Basic study of magnetic microwires for sensor applications: Variety of magnetic structures
... and many other papers, mostly by A. Maziewski, A. Stupakiewicz and A. Zhukov
