Mn12 single molecule magnets deposited on μ-SQUID sensors: the role of interphases and structural modifications

E. Bellido, P. González-Monje, A. Repollés, M. Jenkins, J. Sesé, D. Drung, Th. Schurig, K. Awaga, F. Luis, D. Ruiz-Molina

Nanoscale, 5, 12565-12573, (2013)
DOI: 10.1039/C3NR02359A

http://pubs.rsc.org/en/content/articlehtml/2013/nr/c3nr02359a

Abstract: Direct measurements of the linear ac susceptibility and magnetic relaxation of a few Mn12 monolayers deposited on a μ-SQUID sensor are reported. In order to integrate the molecules into the device, DPN has been the technique of choice. It enabled the structuration of the molecules on the most sensitive areas of the sensor without the need for any previous functionalization of the molecule or the substrate, while controlling the number of molecular units deposited on each array. The measurements reveal that their characteristic SMM behaviour is lost, a fact that is attributed to molecular distortions originated by the strong surface tensions arising at the molecular interphases.

Mn12 single molecule magnets deposited on μ-SQUID sensors: the role of interphases and structural modifications
Deposition of a continuous Mn12bz thin-film covering the whole coil area (sample DPN3). (a) Optical image taken during the integration process. (b) AFM topography image of the replica sample fabricated, under the same conditions as in (a), onto a broken μSQUID susceptometer. (d) Height profile measured along the white dashed line in (b).