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What does a first-order reversal curve diagram really mean? A study case: Array of ferromagnetic nanowires
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10.1063/1.4789613
/content/aip/journal/jap/113/4/10.1063/1.4789613
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/4/10.1063/1.4789613
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

The case of a CPM system: (a) FORCs; (b) Preisach distribution (FORC distribution) represented in and coordinates, where and . Switchings reflected in slope change of the consecutive FORCs: particles that switch “down” on the descending MHL into the applied field interval will switch “up” into interval on each FORC; (c) Preisach distribution (FORC distribution) represented in coordinates, where and .

Image of FIG. 2.
FIG. 2.

Modeled FORC diagrams for different strengths of the interaction fields set up by interwire distance (a), for 40 × 40 nanowire arrays with R = 40 nm, L = 6 μm, Ms  = 485 emu/cm3, assuming normal distributed coercive fields with the average Hc0  = 150 Oe and the standard deviation H  = 20 Oe.

Image of FIG. 3.
FIG. 3.

Interaction field distributions in five states on the descending MHL for the normalized magnetic moment m = 1, 0.5, 0, −0.5, −1, for the nanowire array with the FORC diagram presented in Fig. 2 (a = 250 nm).

Image of FIG. 4.
FIG. 4.

FORC diagram and five Preisach distributions in states on the descending MHL, from top to bottom, for m = 1, 0.5, 0, −0.5, −1. The FORC diagram is the same as in Fig. 2 (a = 250 nm).

Image of FIG. 5.
FIG. 5.

CPM case: switching events and the FORC diagram for a singular uniform distribution of interaction fields between −100 Oe and 100 Oe, with Hc  = 150 Oe.

Image of FIG. 6.
FIG. 6.

MPM case: switching events and the FORC diagram for a singular uniform distribution of interaction fields between −100 Oe and 100 Oe, with Hc  = 150 Oe, for a moving parameter α = −150 Oe.

Image of FIG. 7.
FIG. 7.

MPM case: the FORC diagram in the (Hc , Hu ) plane, and switching events for the system presented in Fig. 6 .

Image of FIG. 8.
FIG. 8.

CPM case: switching events and the FORC diagram for a singular uniform distribution of non-interacting Preisach hysterons with coercive fields between 150 Oe and 250 Oe.

Image of FIG. 9.
FIG. 9.

MPM case: switching events and the FORC diagram for a singular uniform distribution of non-interacting Preisach hysterons with coercive fields between 150 Oe and 250 Oe, for a moving parameter α = −150 Oe.

Image of FIG. 10.
FIG. 10.

MPM case: the FORC diagram in the (Hc , Hu ) plane, and switching events for the system presented in Fig. 9 .

Image of FIG. 11.
FIG. 11.

(a) FORC diagram contours and switching fields distribution (1600 representative points) for the nanowire array with FORC diagram presented in Fig. 2 (a = 250 nm). The gray nuances (colors in the online version) of thepoints represent intrinsic coercive fields. P1,2 are switching events described in (b): applied field (HMHL followed by HFORC 1,2) and effective field for two nanowires with intrinsic coercive fields Hc 1 = 126.9 Oe and Hc 2 = 177.7 Oe, and switching fields identification.

Image of FIG. 12.
FIG. 12.

Switching events (down—↓, and up—↑) on each FORC highlighted in FORC diagram for two nanowires: the nanowire with the smallest coercive field (●) and the nanowire with the largest coercive field (▪). The system is that with the FORC diagram presented in Fig. 2 (a = 250 nm).

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/content/aip/journal/jap/113/4/10.1063/1.4789613
2013-01-31
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: What does a first-order reversal curve diagram really mean? A study case: Array of ferromagnetic nanowires
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/4/10.1063/1.4789613
10.1063/1.4789613
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