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Enhancement of domain-wall mobility at the angular momentum compensation temperature detected by NMR | | Masaki Imai
; Hiroyuki Chudo
; Mamoru Matsuo
; Sadamichi Maekawa
; Eiji Saitoh
; | | Date: |
6 Nov 2019 | | Abstract: | The angular momentum compensation temperature $T_{
m A}$ of ferrimagnets is
attracting attention because of high-speed magnetic dynamics near $T_{
m A}$.
We show that NMR measurement in ferrimagnets is capable of determining $T_{
m
A}$ and domain-wall mobility. We perform a $^{57}$Fe-NMR study on the
ferrimagnet Ho$_3$Fe$_5$O$_{12}$ with $T_{
m A} = 245$~K. The intensity of the
NMR signal from nuclei inside domain walls shows a maximum at $T_{
m A}$.
Conversely, the NMR signal intensity from nuclei inside domains does not show
any anomalies at $T_{
m A}$. Because the domain-wall motion enhances NMR
signal from nuclei inside domain walls, the NMR signal is enhanced at $T_{
m
A}$, where the domain-wall mobility increases. The use of NMR in the
multi-domain state is a powerful tool to estimate the domain-wall mobility as
well as to determine $T_{
m A}$. | | Source: | arXiv, 1911.2207 | | Services: | Forum | Review | PDF | Favorites | |
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