APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

27 Sep 2010

Volume 97, Issue 13, Articles (13xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 97, 133303 (2010); http://dx.doi.org/10.1063/1.3491815 (3 pages)

Yoshihide Fujisaki, Yoshiki Nakajima, Daisuke Kumaki, Toshihiro Yamamoto, Shizuo Tokito, Takahiro Kono, Jun-ichi Nishida, and Yoshiro Yamashita
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Spin excitation frequencies in magnetostatically coupled arrays of vortex state circular Permalloy dots

A. A. Awad, G. R. Aranda, D. Dieleman, K. Y. Guslienko, G. N. Kakazei, B. A. Ivanov, and F. G. Aliev

Appl. Phys. Lett. 97, 132501 (2010); http://dx.doi.org/10.1063/1.3495774 (3 pages) | Cited 8 times

Online Publication Date: 28 September 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Broadband ferromagnetic resonance in square arrays of Permalloy circular dots with different interdot separations was measured in the vortex ground state. The detected spin excitations show a complicated dependence of their frequencies on the interdot coupling strength. A considerable influence of the interdot separation on the gyrotropic vortex frequency and splitting of the azimuthal spin wave frequencies was detected. The gyrotropic frequency and the first azimuthal doublet frequency splitting depend nonmonotonously on the interdot spacing, whereas the dependence of the second doublet frequency splitting on this parameter is monotonous. The observed effects are explained by the influence of both the dipolar and quadrupolar contributions to the dynamic magnetostatic interactions.
Show PACS
75.30.Ds Spin waves
75.50.Tt Fine-particle systems; nanocrystalline materials
75.50.Bb Fe and its alloys
75.75.-c Magnetic properties of nanostructures
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance

Stability studies of exchange bias field of Mn80Ir20/Co60Fe20B20 by network analyzer ferromagnetic resonance

J. Yang, S. Cardoso, P. P. Freitas, T. Devolder, and M. Ruehrig

Appl. Phys. Lett. 97, 132502 (2010); http://dx.doi.org/10.1063/1.3491844 (3 pages) | Cited 3 times

Online Publication Date: 29 September 2010

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The stability of the exchange bias field Heb has been studied for Mn80Ir20/Co60Fe20B20 thin films by means of network analyzer ferromagnetic resonance. The results demonstrated that Heb decreases with increasing temperature. The observed variation in the magnitude of Heb and even a reversal in the sign of Heb as a function of time above room temperature can be interpreted by a thermally activated reversal of antiferromagnetic domains as evidenced by the linear dependence of Heb on ln t according to the Néel–Arrhenius law. Moreover, the correlation between the reversal of antiferromagnetic domains and the antiferromagnetic grain volume is obtained.
Show PACS
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.70.Ak Magnetic properties of monolayers and thin films
75.70.Kw Domain structure (including magnetic bubbles and vortices)
75.30.Et Exchange and superexchange interactions
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
75.50.Ee Antiferromagnetics
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close