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2017 ; 3
(3
): e1602094
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Band structure evolution during the ultrafast ferromagnetic-paramagnetic phase
transition in cobalt
#MMPMID28378016
Eich S
; Plötzing M
; Rollinger M
; Emmerich S
; Adam R
; Chen C
; Kapteyn HC
; Murnane MM
; Plucinski L
; Steil D
; Stadtmüller B
; Cinchetti M
; Aeschlimann M
; Schneider CM
; Mathias S
Sci Adv
2017[Mar]; 3
(3
): e1602094
PMID28378016
show ga
The evolution of the electronic band structure of the simple ferromagnets Fe, Co,
and Ni during their well-known ferromagnetic-paramagnetic phase transition has
been under debate for decades, with no clear and even contradicting experimental
observations so far. Using time- and spin-resolved photoelectron spectroscopy, we
can make a movie on how the electronic properties change in real time after
excitation with an ultrashort laser pulse. This allows us to monitor large
transient changes in the spin-resolved electronic band structure of cobalt for
the first time. We show that the loss of magnetization is not only found around
the Fermi level, where the states are affected by the laser excitation, but also
reaches much deeper into the electronic bands. We find that the
ferromagnetic-paramagnetic phase transition cannot be explained by a loss of the
exchange splitting of the spin-polarized bands but instead shows rapid band
mirroring after the excitation, which is a clear signature of extremely efficient
ultrafast magnon generation. Our result helps to understand band structure
formation in these seemingly simple ferromagnetic systems and gives first clear
evidence of the transient processes relevant to femtosecond demagnetization.