Reduction of Magnetic Moments in Very Thin Cr Layers ofFe/CrMultilayers: Evidence from119SnMössbauer Spectroscopy

Abstract

Fe/Cr multilayers with monatomic Sn layers embedded in the Cr layers were grown epitaxially on MgO(001) substrates, and the magnetic hyperfine field at the 119Sn nuclear sites was examined using Mössbauer spectroscopy. It was found that nonzero hyperfine field is induced at the Sn sites at room temperature and that the value reduces drastically from 10 to 2 T when the Cr layer thickness decreases from 80 to 10 A. The result indicates that the Cr layers are magnetically ordered even when the thickness is very small and that the magnetic moments of Cr become smaller as the Cr layer thickness decreases.

Exchange Bias in Fe@Cr Core–Shell Nanoparticles

“…The reduction in spin moment also highlights the difference between flat and nanoparticle interfaces as no reduction in Fe spin moment has been observed in epitaxial Fe/Cr multilayers [26] . A significant reduction in the Fe moment has been observed in an epitaxial Fe/Cr interface after roughening by Ar sputtering [22] .…”

“…Here we study the magnetic behaviour as the Cr layer grows around Fe nanoparticles, which is a highly frustrated system in which different behaviour is expected. It has been shown that the magnetic behaviour of the Fe/Cr interface is highly sensitive to the details of the topography [22] .…”

Growth-orientation dependence of magnetic properties of Cr-based multilayers with 119Sn monatomic layers

“…Our reports up to date on Cr/Sn and Fe/ Cr/Sn/Cr multilayers with the BCC (0 0 1) orientation are as follows. (i) The magnetic moments of Cr are enhanced at the interfaces in Cr(0 0 1)/Sn multilayers [2], whereas they are reduced in Fe(0 0 1)/Cr/Sn/Cr multilayers when the Cr thickness (t Cr ) is very thin [3,4]. (ii) In Cr(0 0 1)/Sn multilayers with t Cr X80 ( A at low temperatures, SDWs are stabilized with the antinodes located at the Cr/Sn interfaces and the wave vectors along the outof-plane [0 0 1] direction [5,6].…”

Magnetism and hyperfine magnetic fields in Fe/Cr/Sn/Cr and Cr/Sn multilayers

“…ossbauer spectroscopy [1]. The main results were the detection of a hyperfine field at Sn nuclei (B Sn ) and the dependence of its magnitude on the Cr layer thickness.…”