Microsite es: . Grupo:
You are here

Magnetic fluctuations of the very small

Friday, October 20, 2017 - 12:00
Place: 
CFM Auditorium
Who: 
Julen Ibañez-Azpiroz (CFM)
Source Name: 
CFM

Single-adatoms deposited on metallic substrates offer an exceptional
playground for studying magnetism at the atomic scale and give rise to
many intriguing questions. For instance, although several adatoms
exhibit a large magnetic anisotropy energy as measured by X-ray Magnetic
Circular Dichroism [1], the very same adatoms behave as paramagnetic
objects when probed by Scanning Tunneling Spectroscopy (STS) [2, 3].
Motivated by this apparent contradiction, we analyze the role of quantum
fluctuations of the adatom’s spin at T=0, the so-called zero-point
spin-fluctuations utilizing time-dependent density functional theory
[4]. Remarkably, while spin-fluctuations weaken magnetism, they can be
used to detect magnetic signals even in non-magnetic adatoms, which can
exhibit intense paramagnetic spin-excitations tunable with a magnetic
field and potentially observable with inelastic STS [5].



[1] P. Gambardella et al., Science 300, 1130 (2003).



[2] L. Zhou et al., Nat. Phys. 6, 187 (2010).



[3] A. A. Khajetoorians, et al., PRL 106, 037205 (2011).



[4] J. Ibañez-Azpiroz et al., Nano Lett. 16, 4305 (2016).



[5] J. Ibañez-Azpiroz et al., PRL 119, 017203 (2017)


x
We use third party cookies to improve our services and tailor the website to your surfing habits. By continuing to browse the site, you are agreeing to our use of cookies policy. Further information on the use of cookies.