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Confinement effects on the low temperature magnetic structure of MnP nanocrystals
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) FC and ZFC Magnetizations measured at 1 kOe, normalized to the values at 5 K and 50 kOe, of (a) MnP film, (b) GaP:MnP, and for MnP powder (black line). (c) Magnetization derivatives showing the two magnetic transitions. Magnetization cycles at 5 K, 130 K, and 300 K of (d) MnP film and (e) GaP:MnP epilayer.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Calculated angles between the magnetic moments of two successive planes (α) in grains with N = 25 (7.4 nm) and 60 (18 nm) along their hard a axis. (b) 3D representations of the ends of the magnetic moment vectors for each plane in two cases N = 28 (circles) and N = 32 (triangles). The arrows indicate the directions of the resulting moments of the whole grain (vertical N = 28 (8.3 nm) and horizontal N = 32 (9.5 nm)).

Image of FIG. 3.
FIG. 3.

(Color online) Magnetization normalized to the fully ferromagnetic value vs. the number of planes in the grain (a) along b direction (red circles) and along c (grey triangles). (b) Modulus of the normalized magnetization. N = 10 corresponds to ca. 3 nm.

Image of FIG. 4.
FIG. 4.

(Color online) Evolution of TC and TN, with the absolute value of J2/J1 (J1 ferro- and J2 antiferro-magnetic coupling constants) in bulk MnP for different conditions: (a) J1 = constant and (b) (J1 − J2) = constant.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Confinement effects on the low temperature magnetic structure of MnP nanocrystals