The effect of interelement dipole coupling in patterned ultrathin single crystal Fe square arrays

Abstract

The correlation between the magnetic properties and the interelement separation in patterned arrays of ultrathin single crystal Fe films of 12 monolayers (ML) grown on GaAs(100) has been studied. The critical condition to form single domain remanent states in the square elements was found to be 10 μm in size and 20 μm for the interelement separation. The coercivity was also found to increase with the increasing interelement separation in the patterned arrays. These results are attributed to the competition between the large in-plane uniaxial anisotropy, the demagnetizing field, and interelement dipole coupling as determined semiqualitatively by the ferromagnetic resonance measurements.

Ferromagnetic resonance of a magnetic dimer with dipolar coupling

“…For this reason, many theoretical and experimental investigations are carried out towards a better control of this parameter and a better understanding of its effect on the magnetization dynamics in magnetic multilayers. In particular, the nature of this coupling is of special interest and its characterization is still a target of intense investigation 1,3,4,[9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] . Depending on the intrinsic properties of the constituting layers (underlying material, thickness, roughness, energy parameters, etc.)…”

Spin configuration of magnetic multi-layers: effect of exchange, dipolar and Dzyalozhinski–Moriya interactions

“…Therefore, it is of paramount importance to fathom the nature of interaction acting at the interface and the role it plays in conveying any perturbation through the multi-layer system. There is a great amount of published work investigating the interface coupling and its effects on the magnetic properties [11,[28][29][30][31][32][33][34][35]. For instance, in [11] the authors investigated the magnetization dynamics due to spin currents in magnetic double layers and argued that transport in this structure is governed by a kind of long-range interaction called dynamic exchange coupling.…”

“…In addition to the Ruderman-Kittel-Kasuya-Yosida (RKKY) oscillatory coupling, several other kinds of interlayer coupling have been investigated and their effects studied in various situations. These are the effective exchange coupling [33], the dipolar coupling [28,35,36] and the Dzyalozhinski-Moriya (DM) coupling [30,[37][38][39].…”

“…Therefore, it is of paramount importance to fathom the nature of interaction acting at the interface and the role it plays in conveying any perturbation through the multi-layer system. There is a great amount of published work investigating the inter-layer coupling and its effects on the magnetic properties [8,[21][22][23][24][25][26][27][28]. For instance, in Ref.…”