Ultrafast magnetization dynamics in the half-metallic Heusler alloy <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Co</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi>FeAl</mml:mi></mml:math>

Ultrafast laser induced local magnetization dynamics in Heusler compounds

The overarching goal of the field of femtomagnetism is to control, via laser light, the magnetic structure of matter on a femtosecond time scale. The temporal limits to the light-magnetism interaction are governed by the fact that the electron spin interacts indirectly with light, with current studies showing a laser induced global loss in the magnetic moment on a time scale of the order of a f...

Micromagnetic simulation of high-power spin-torque oscillator in half- metallic Heusler alloy spin valve nanopillar

Unifying ultrafast magnetization dynamics.

We present a microscopic model that successfully explains the ultrafast equilibration of magnetic order in ferromagnetic metals at a time scale tau(M) of only a few hundred femtoseconds after pulsed laser excitation. It is found that tau(M) can be directly related to the so-called Gilbert damping factor sigma that describes damping of GHz precessional motion of the magnetization vector. Indepen...

Heusler alloy showing room temperature half - metallicity at the surface

In this article we investigate the surface spin polarization in a 100 nm Co 2 Cr 0.6 Fe 0.4 Al (CCFA) film grown ex situ epitaxially on MgO(100) with a 10 nm Fe buffer layer by means of spin resolved photoemission. We show that a careful in situ preparation of the sample surface leads to values for the room temperature spin polarization up to 45% at the Fermi level. To our knowledge, this is th...

Ferrimagnetism and antiferromagnetism in half-metallic Heusler alloys

Iosif Galanakis∗1, Kemal Özdoğan2, Ersoy Şaşıoğlu3,4, and Bekir Aktaş2 1 Department of Materials Science, University of Patras, GR-26504 Patra, Greece 2 Department of Physics, Gebze Institute of Technology, Gebze, 41400, Kocaeli, Turkey 3 Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich, Germany 4 Fatih University, Physics Department, 34500, Büyükçekmece, İstanbul, Turkey