Figure 5 - uploaded by Stefano Giordano
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a) Magnetic configuration of a uni-axial magnetoelastic layer submitted to an in-plane magnetic polarization HS and excitation h. b) Example of a calculated magnetization response to the excitation h for 3 cases HS > HA (above the SRT), HS < HA (bistable zone) and HS = HA (SRT point).
Contexts in source publication
Context 1
... such layers, and in the magnetic configuration described on fig.5a, the magnetic free energy density of the system can be written: ...
Context 2
... earlier, when t → 0, the susceptibility of the order parameter with respect to the external field tends to infinity. Here, when the polarizing field H S is close to H A , the magnetization susceptibility to the external field h becomes very high and as shown on fig.5b, its response is also higly non-linear. ...
Context 3
... similar dependence on the magnetization angle ϕ to that of an anisotropy energy and therefore, because of the magnetoelastic coupling, any applied stress will affect the overall anisotropy of the magnetic layer. As shown on fig.8b, in the absence of a stress, two stable positions for the magnetization exist for H < H A (bistable mode as shown on fig. 5b), and they are aligned along the x and y axis for H = √ H A /2. The application of tensile or compressive stress along the x axis modifies the shape of the free energy ( fig.5b) and induces the switch of magnetic moments from one stable position to the other via the magnetoelastic interaction. The stress can be very efficiently ...
Context 4
... and they are aligned along the x and y axis for H = √ H A /2. The application of tensile or compressive stress along the x axis modifies the shape of the free energy ( fig.5b) and induces the switch of magnetic moments from one stable position to the other via the magnetoelastic interaction. ...
Context 5
... such layers, and in the magnetic configuration described on fig.5a, the magnetic free energy density of the system can be written: ...
Context 6
... earlier, when t → 0, the susceptibility of the order parameter with respect to the external field tends to infinity. Here, when the polarizing field H S is close to H A , the magnetization susceptibility to the external field h becomes very high and as shown on fig.5b, its response is also higly non-linear. ...
Context 7
... similar dependence on the magnetization angle ϕ to that of an anisotropy energy and therefore, because of the magnetoelastic coupling, any applied stress will affect the overall anisotropy of the magnetic layer. As shown on fig.8b, in the absence of a stress, two stable positions for the magnetization exist for H < H A (bistable mode as shown on fig. 5b), and they are aligned along the x and y axis for H = √ H A /2. The application of tensile or compressive stress along the x axis modifies the shape of the free energy ( fig.5b) and induces the switch of magnetic moments from one stable position to the other via the magnetoelastic interaction. The stress can be very efficiently ...
Context 8
... and they are aligned along the x and y axis for H = √ H A /2. The application of tensile or compressive stress along the x axis modifies the shape of the free energy ( fig.5b) and induces the switch of magnetic moments from one stable position to the other via the magnetoelastic interaction. ...
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Citations
... 4 Also, antiferromagnets demonstrate resonant frequencies up to terahertz, which opens up the possibility of developing high-speed magnetic bias-free signal processing devices. [5][6][7] These advantages make antiferromagnets good candidates for developing microwave devices for potential applications in magnetic memory, 8 tunable detectors, [9][10][11] and oscillators, [12][13][14][15] waveguides, 16 etc. ...
... 20,21 In particular, the so-called strain-or stress-mediated magnetoelectric coupling is of high interest, especially for magnetic memory applications. 8,22 The research works into various effects caused by magnetoelastic interaction in antiferromagnets are conducted for a long time and are still relevant. 23 In contrast to previous works, [23][24][25] this article discusses the influence of uniaxial pressure on the frequencies of ferro-and antiferromagnetic resonance. ...
In this work, we present the results of investigations performed on hematite (α-Fe2O3), which is an antiferromagnet with weak ferromagnetism. Through the use of Brillouin light scattering spectroscopy, we studied experimentally the excitation of quasi-ferro- and antiferromagnetic modes in the bulk hematite. We investigated the influence of relative mechanical strains, ϵyy, on the frequencies of quasi-ferro- and antiferromagnetic modes. Also, we considered the angular dependence of the frequency of the quasi-ferromagnetic mode on the external magnetic field. Our results indicate that hematite is a suitable material for strain-controlled magnonic devices.
