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Resolving the spin polarization and magnetic domain wall width of (Nd,Dy)$_{2}$Fe$_{14}$B with spin-polarized scanning tunneling microscopy

Miyamachi, Toshio; Sürgers, Christoph; Wulfhekel, Wulf

The electronic structure and the domain wall width of industrial (Nd,Dy)$_{2}$Fe$_{14}$B hard magnets were investigated using low-temperature, spin-polarized scanning tunneling microscopy (STM) in ultra-high vacuum. In a first step, atomically clean and flat surfaces were prepared. The flat terraces were separated by monatomic steps. Surface termination was identified as the Fe c layer from atomically resolved STM imaging. The electronic density of states and its spin polarization agree well with ab initio predictions of the Fe c layer. High-resolution spin-polarized STM images allowed to finally resolve the domain wall width w of only 3.2 ± 0.4 nm.

Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Institut für Quantenmaterialien und -technologien (IQMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1882-0778, 1882-0786
KITopen-ID: 1000139198
HGF-Programm 47.11.02 (POF IV, LK 02) Emergent Quantum Phenomena
Erschienen in Applied physics express. Letter
Verlag IOP Publishing
Band 14
Heft 11
Seiten Art.Nr. 115504
Vorab online veröffentlicht am 13.10.2021
Nachgewiesen in Web of Science
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