Limits...
Magnonic band structure investigation of one-dimensional bi-component magnonic crystal waveguides.

Ma FS, Lim HS, Zhang VL, Ng SC, Kuok MH - Nanoscale Res Lett (2012)

Bottom Line: Our results show that the widths and center frequencies of the bandgaps are controllable by the component materials, the stripe widths, and the orientation of the applied magnetic field.One salient feature of the bandgap frequency plot against stripe width is that there are n-1 zero-width gaps for the nth bandgap for both transversely and longitudinally magnetized waveguides.Additionally, the largest bandgap widths are primarily dependent on the exchange constant contrast between the component materials of the nanostructured waveguides.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Physics, National University of Singapore, Singapore, 117542, Singapore. phylimhs@nus.edu.sg.

ABSTRACT
The magnonic band structures for exchange spin waves propagating in one-dimensional magnonic crystal waveguides of different material combinations are investigated using micromagnetic simulations. The waveguides are periodic arrays of alternating nanostripes of different ferromagnetic materials. Our results show that the widths and center frequencies of the bandgaps are controllable by the component materials, the stripe widths, and the orientation of the applied magnetic field. One salient feature of the bandgap frequency plot against stripe width is that there are n-1 zero-width gaps for the nth bandgap for both transversely and longitudinally magnetized waveguides. Additionally, the largest bandgap widths are primarily dependent on the exchange constant contrast between the component materials of the nanostructured waveguides.

No MeSH data available.


Calculated maximal widths of the first three bandgaps. (a) Magnetic parameter contrasts between component materials in the MCWs, which are arranged in order of decreasing exchange constant ratio. The dashed line represents the contrast ratio equal to 1. Maximal widths of the magnonic bandgap for (b) transversely and (c) longitudinally magnetized MCWs of all the considered material combinations under applied field H = 600 mT.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3475054&req=5

Figure 6: Calculated maximal widths of the first three bandgaps. (a) Magnetic parameter contrasts between component materials in the MCWs, which are arranged in order of decreasing exchange constant ratio. The dashed line represents the contrast ratio equal to 1. Maximal widths of the magnonic bandgap for (b) transversely and (c) longitudinally magnetized MCWs of all the considered material combinations under applied field H = 600 mT.

Mentions: The calculated maximal widths of the first three bandgaps are shown in Figure 6. In Figure 6a, magnetic parameter contrasts (static magnetization contrast, Ms,A/Ms,B, exchange constant contrast, AA/AB, and exchange length contrast, lex,A/lex,B) between the component materials of the MCWs are plotted. The calculated maximum widths of the first three bandgaps of the transversely and longitudinally magnetized MCWs are shown in Figure 6b,c, respectively. As shown in Figure 6b,c, the maximum widths of the bandgaps are dependent on the component materials of the MCWs.


Magnonic band structure investigation of one-dimensional bi-component magnonic crystal waveguides.

Ma FS, Lim HS, Zhang VL, Ng SC, Kuok MH - Nanoscale Res Lett (2012)

Calculated maximal widths of the first three bandgaps. (a) Magnetic parameter contrasts between component materials in the MCWs, which are arranged in order of decreasing exchange constant ratio. The dashed line represents the contrast ratio equal to 1. Maximal widths of the magnonic bandgap for (b) transversely and (c) longitudinally magnetized MCWs of all the considered material combinations under applied field H = 600 mT.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3475054&req=5

Figure 6: Calculated maximal widths of the first three bandgaps. (a) Magnetic parameter contrasts between component materials in the MCWs, which are arranged in order of decreasing exchange constant ratio. The dashed line represents the contrast ratio equal to 1. Maximal widths of the magnonic bandgap for (b) transversely and (c) longitudinally magnetized MCWs of all the considered material combinations under applied field H = 600 mT.
Mentions: The calculated maximal widths of the first three bandgaps are shown in Figure 6. In Figure 6a, magnetic parameter contrasts (static magnetization contrast, Ms,A/Ms,B, exchange constant contrast, AA/AB, and exchange length contrast, lex,A/lex,B) between the component materials of the MCWs are plotted. The calculated maximum widths of the first three bandgaps of the transversely and longitudinally magnetized MCWs are shown in Figure 6b,c, respectively. As shown in Figure 6b,c, the maximum widths of the bandgaps are dependent on the component materials of the MCWs.

Bottom Line: Our results show that the widths and center frequencies of the bandgaps are controllable by the component materials, the stripe widths, and the orientation of the applied magnetic field.One salient feature of the bandgap frequency plot against stripe width is that there are n-1 zero-width gaps for the nth bandgap for both transversely and longitudinally magnetized waveguides.Additionally, the largest bandgap widths are primarily dependent on the exchange constant contrast between the component materials of the nanostructured waveguides.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Physics, National University of Singapore, Singapore, 117542, Singapore. phylimhs@nus.edu.sg.

ABSTRACT
The magnonic band structures for exchange spin waves propagating in one-dimensional magnonic crystal waveguides of different material combinations are investigated using micromagnetic simulations. The waveguides are periodic arrays of alternating nanostripes of different ferromagnetic materials. Our results show that the widths and center frequencies of the bandgaps are controllable by the component materials, the stripe widths, and the orientation of the applied magnetic field. One salient feature of the bandgap frequency plot against stripe width is that there are n-1 zero-width gaps for the nth bandgap for both transversely and longitudinally magnetized waveguides. Additionally, the largest bandgap widths are primarily dependent on the exchange constant contrast between the component materials of the nanostructured waveguides.

No MeSH data available.