TY - JOUR
KW - Thin films
KW - Anisotropy
KW - Perovskite
KW - Film growth
KW - Signal processing
KW - Nickel compounds
KW - Iron compounds
KW - Ferroelectric materials
KW - Magnetic anisotropy
KW - Nanostructures
KW - Bismuth compounds
KW - Aspect ratio
KW - Magnetoelectric
KW - Ferrite
KW - Device architectures
KW - Ferrimagnetism
KW - Magnetostatics
KW - Microwave materials processing
KW - Soft magnetic materials
KW - Ferrimagnetic
KW - Magnetostatic interactions
KW - Microwave signal processing
KW - Multifunctional thin-films
KW - Spinel
KW - Uniaxial magnetic anisotropy
AU - S.P Crane
AU - C Bihler
AU - M.S Brandt
AU - S.T.B Goennenwein
AU - M Gajek
AU - Ramamoorthy Ramesh
AB - Multifunctional thin film nanostructures containing soft magnetic materials such as nickel ferrite are interesting for potential applications in microwave signal processing because of the possibility to shrink the size of device architecture and limit device power consumption. An essential prerequisite to future applications of such a system is a firm understanding of its magnetic properties. We show that nanostructures composed of ferrimagnetic NiFe2O4 pillars in a multiferroic BiFeO3 matrix can be tuned magnetically by altering the aspect ratio of the pillars by depositing films of varying thickness. Magnetic anisotropy is studied using ferromagnetic resonance, which shows that the uniaxial magnetic anisotropy in the growth direction changes sign upon increasing the film thickness. The magnitude of this anisotropy contribution can be explained via a combination of shape and magnetostatic effects, using the object-oriented micromagnetic framework (OOMMF). The key factors determining the magnetic properties of the films are shown to be the aspect ratio of individual pillars and magnetostatic interactions between neighboring pillars. © 2008 Elsevier B.V. All rights reserved.
BT - Journal of Magnetism and Magnetic Materials
DO - 10.1016/j.jmmm.2008.08.114
LA - eng
M1 - 4
N1 - cited By 46
N2 - Multifunctional thin film nanostructures containing soft magnetic materials such as nickel ferrite are interesting for potential applications in microwave signal processing because of the possibility to shrink the size of device architecture and limit device power consumption. An essential prerequisite to future applications of such a system is a firm understanding of its magnetic properties. We show that nanostructures composed of ferrimagnetic NiFe2O4 pillars in a multiferroic BiFeO3 matrix can be tuned magnetically by altering the aspect ratio of the pillars by depositing films of varying thickness. Magnetic anisotropy is studied using ferromagnetic resonance, which shows that the uniaxial magnetic anisotropy in the growth direction changes sign upon increasing the film thickness. The magnitude of this anisotropy contribution can be explained via a combination of shape and magnetostatic effects, using the object-oriented micromagnetic framework (OOMMF). The key factors determining the magnetic properties of the films are shown to be the aspect ratio of individual pillars and magnetostatic interactions between neighboring pillars. © 2008 Elsevier B.V. All rights reserved.
PB - Elsevier
PY - 2009
EP - L5
T2 - Journal of Magnetism and Magnetic Materials
TI - Tuning magnetic properties of magnetoelectric BiFeO3-NiFe2O4 nanostructures
VL - 321
SN - 03048853
ER -