NM07.02.01 : Hybrid Magnetic Heterostructures

1:30 PM–2:00 PM Apr 3, 2018 (America - Denver)

PCC North, 200 Level, Room 231 A

Ivan Schuller1 Ali Basaran1 Jose de la Venta2 Juan Gabriel Ramirez3 Thomas Saerbeck4 Ilya Valmianski1

1, University of California, San Diego, La Jolla, California, United States
2, Colorado State University, Fort Collins, Colorado, United States
3, Universidad de los Andes, Colombia, , Colombia
4, Institut Laue-Langevin, Grenoble, , France

Hybrid materials allow the engineering of new material properties by creative uses of proximity effects. When two dissimilar materials are in close physical proximity the properties of each one may be radically modified or occasionally a completely new material emerges. In the area of magnetism, controlling the magnetic properties of ferromagnetic thin films without magnetic fields is an on- going challenge with multiple technological implications for low- energy consumption memory and logic devices. Interesting possibilities include ferromagnets in proximity to dissimilar materials such as antiferromagnets or oxides that undergo metal-insulator transitions. The proximity of ferromagnets to antiferromagnets has given rise to the extensively studied Exchange Bias[1].
In a series of recent studies, we have investigated the magnetic properties of different hybrids of ferromagnets (Ni, Co and Fe) and oxides, which undergo metal-insulator and structural phase transitions. Both the static as well as dynamical properties of the ferromagnets are drastically affected. Static properties such as the coercivity, anisotropy and magnetization [2-3] and dynamical properties such as the microwave response are clearly modified by the proximity effect and give raise to interesting perhaps useful properties.

The oxide growth and characterization supported by the US-AFOSR and the magnetic studies funded by US-DOE

Selected References:
[1] Exchange Bias, Josep Nogues and Ivan K. Schuller, J. Magn. Magn. Mater. 192, 203 (1999).
[2] Control of Magnetism Across Metal to Insulator Transitions, J. de la Venta, Siming Wang, J. G. Ramirez, and Ivan K. Schuller, App. Phys. Lett. 102, 122404 (2013).
[3] Coercivity Enhancement in V2O3/Ni Bilayers Driven by Nanoscale Phase Coexistence, J. de la Venta, Siming Wang, T. Saerbeck, J. G. Ramirez, I. Valmianski, and Ivan K. Schuller, Appl. Phys. Lett. 104, 062410 (2014).
[4] Collective Mode Splitting in Hybrid Heterostructures, Juan Gabriel Ramírez, J. de la Venta, Siming Wang, Thomas Saerbeck, Ali C. Basaran, X. Batlle, and Ivan K. Schuller, Phys. Rev. B, 93, 214113 (2016).