On the Magnetic Anisotropy of Single Crystal of Mn₅Ge₃

Simulation of the enhanced Curie temperature in Mn5Ge3Cx compounds

“…13 However, an increase of the corresponding Mn II -Mn II distance from 2.974 to 3.057 Å after structure relaxation leads to the change from AFM to FM J 3 parameter, while the rest of the parameters are left almost unchanged. As a result the estimated value of the T C = 400 K for the relaxed Mn 5 Ge 3 system is somewhat higher than for the rigid one of 320 K and than the corresponding experimentally observed value of 304 K. 2 ϩThe results presented in Table II show that interstitial carbon, even without relaxation, significantly changes the value of J 2 , J 3 , and J 6 , leaving the J 4 and J 1 interactions almost unaffected. In particular, the J 3 interaction becomes strongly FM compared to the undoped Mn 5 Ge 3 .…”

“…Mavropoulos, 2 5 Ge 3 C x films with x Ն 0.5 were experimentally shown to exhibit a strongly enhanced Curie temperature T C compared to Mn 5 Ge 3 . In this letter we present the results of our first principles calculations within Green's function approach, focusing on the effect of carbon doping on the electronic and magnetic properties of the Mn 5 Ge 3 .…”

Magnetic anisotropy in epitaxial Mn5Ge3films

“…As the film thickness increases, the contribution of the magnetocrystalline energy grows. Since bulk Mn 5 Ge 3 exhibits uniaxial anisotropy along the c axis, 28 we expect a reorientation of the magnetization from the in-plane to the out-of-plane direction as it occurs in very similar systems: for example, in epitaxial (0001) hcp cobalt films grown on ruthenium, 16 magnetic domains with perpendicular anisotropy are formed above a critical thickness of 50 nm. The comparison between the shape of the magnetization curves for the two systems is striking and suggests the presence of a stripe domain structure in Mn 5 Ge 3 films at least thicker than 25 nm.…”

“…The magnetocrystalline constant (K) is extracted from experimental measurements 28 at 77 K and is extrapolated to 15 K; it equals to 4.3 × 10 6 erg/cm 3 . The exchange (A) and saturation magnetization (M 0 ) constants, however, are taken as adjustable parameters.…”

Magnetic and structural properties ofGexMn1−xfilms: Precipitation of intermetallic nanomagnets

“…18,19 The presence of such a magnetic anisotropy in an assembly of superparamagnetic fine particles leads to the existence of an anisotropy energy barrier E A ,…”