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Coercivity control in finite arrays of magnetic particles
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View: Figures


Image of FIG. 1.
FIG. 1.

Geometry of a square array of small magnetic particles lattice with lattice constant l. The angle θ specifies the unit vector of magnetic moment .

Image of FIG. 2.
FIG. 2.

Hysteresis loops obtained by energy minimization method with ΔH ext = 0.002Ms (solid curves) and ΔH ext = 0.005Ms (dashed curves) for 5 × 5 in-plane magnetic spins array. The left-top and right-down insets show the configurations of the magnetic moments at H ext = −0.330Ms for ΔH ext = 0.002Ms and ΔH ext = 0.005Ms , respectively.

Image of FIG. 3.
FIG. 3.

(Color online) Magnetization loops obtained by the energy minimization method (red solid) and the dynamic method (black solid) for n × n (n = 2, 3,…, 11) in-plane magnetic spins arrays. Computed loops from the two approaches agree so well with each other that those from energy minimization are only displayed in (i) and (j), and as the lower line in (c) and the upper line in (h). The rest are the loops calculated using the dynamic method. The right insets of (a)-(j) show the spin configurations when H ext = 0; The left insets of (d)-(j) show the spin configurations at the jump in hysteresis loops around H ext = −Ms .

Image of FIG. 4.
FIG. 4.

Hysteresis loops of n × n rectangular magnetic particles array with lx/ly = 0.8 (dashed), lx /ly = 1 (solid), lx /ly = 1.25 (dotted-dashed) for (a) n = 5; (b) n = 10. The external field is applied in the y-direction as mentioned above.

Image of FIG. 5.
FIG. 5.

Hysteresis loops of 5 × 5 magnetic particles array with defect located at the i row and the j column of the array (i, j = 1, 2, 3). The right insets show the spin configurations when H ext = 0.

Image of FIG. 6.
FIG. 6.

Reduced coercive force Hc /pMs (solid curves) and remanence Mr /Ms (dashed curves) vary with normalized random perturbation amplitude Ar /l for 3 × 3 (circles) and 10 × 10 (squares) arrays.

Image of FIG. 7.
FIG. 7.

(Color online) Various of hysteresis loops of different 3 × 3 magnetic particles arrays when Ar  = 0.4. The insets show spin configurations of these disordered arrays when H ext = 0.

Image of FIG. 8.
FIG. 8.

Hysteresis loops of 10 × 10 magnetic particles array when Ar  = 0.4 with the maximal coercive force (solid curve) and the minimum coercive force (dotted-dashed curve).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Coercivity control in finite arrays of magnetic particles