Induced Fe and Mn magnetic moments in Co-FeMn bilayers on Cu(001)

Abstract

Using photoemission electron microscopy in combination with x-ray magnetic circular dichroism, element selective magnetic domain images have been obtained from single-crystalline Co/FeMn and FeMn/Co bilayers epitaxially grown on a Cu(001) single crystal. The contact with ferromagnetic Co leads to the observation of a net magnetic moment in Fe and Mn, independently of the paramagnetic or antiferromagnetic state of the FeMn thin films. Only a small fraction of this moment might mediate the magnetic interaction at the interface, and thus be responsible for the exchange bias effect

Huge magnetocrystalline anisotropy of x-ray linear dichroism observed onCo∕FeMnbilayers

“…This size of induced ferromagnetic alignment is consistent with our earlier investigation of FeMn/Co bilayers. 19 Furthermore, the Fe XMLD originating from induced moments at the interface decreases with increasing total FeMn thickness, so that the expected Fe XMLD signal would be within the noise of the measurement of the spectra of Ref. 21, which were taken for a 15 ML FeMn film.…”

Determination of the Fe magnetic anisotropies and the CoO frozen spins in epitaxial CoO/Fe/Ag(001)

“…The strength of the uniaxial anisotropy in our CoO/Fe/Ag(001) system after field cooling is above 3000 Oe, which is much greater than the previous experimental data. This may be due to the epitaxial growth nature of our sample and the strong CoO magnetic anisotropy (~2.7×10 8 erg/cm 3 [53] FeMn/Co/Cu(001) system and was attributed to step-induced uncompensated spins at the AFM surface [44,45,46]. We don't know if the same mechanism accounts for the CoO/Fe/Ag(001) system.…”

“…The exchange bias field obtained directly from the easy-axis hysteresis loop measurement is also shown in Fig. 3 The switching of the 4-fold anisotropy easy axis in AFM/FM system was also reported in other AFM/FM system [44,45,46] and was attributed to the interfacial spin frustration. This result is consistent with our previous result [31].…”

Evolution of magnetic properties at the interface Fe x Mn 1– x /Ni

“…Applying the field in-plane yielded no signal. On the other hand XMCD (X-ray Magnetic Circular Dichroism) experiments have shown that for the system Fe x Mn 1−x /Co/Cu(100) 'uncompensated' Fe spins exist [4]. On the basis of these observations we used a perpendicular magnetized 25 ML Ni/Cu(100) as a substrate.…”