Statistic regularities of magnetization jumps in K_0.4[Cr(CN)₆][Mn(R/S)‐pn](R/S)‐pnH_0.6 ferrimagnet

Abstract

A series of two types of stochastic magnetization jumps in K0.4[Cr(CN)6][Mn(R/S)‐pn](R/S)‐pnH0.6 single crystals (pn = 1,2‐diaminopropane) are reported. Large jumps appear on the demagnetization branch of the hysteresis loop at the critical value of the decreasing magnetic field. The correlation of the temperature dependence of jump magnetic field and the temperature dependence of magnetic anisotropy field indicates a contribution of magnetic anisotropy to nonlinear spin‐soliton structure. Small magnetization jumps occur in both magnetization and demagnetization regimes.

Time resolved FORC analysis and magnetic anisotropy in K0.4[Cr(CN)6][Mn(S)-pn] (S)-pnH0.6 chiral molecular magnets

“…The presence of minimum in the starting portions of the reversal M(H) curves (see insertion in figure 1(a)) can be explained by magnetic relaxation studied in these crystals earlier [5,6]. One can expect that the FORC diagram depends on delay time between magnetic field switching and reversal curve recording.…”

“…Significant efforts of scientists focused on understanding the origin of nonlinear spin excitations and their contribution to magnetic properties of molecular based magnets are reported in [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

“…In K 0.4 [Cr(CN)6][Mn(S)-pn](S)-pnH 0.6 crystals and a series of similar molecular magnets, unusual domain dynamics [1,2] and expected vortex configurations of the domain walls as well as the possible spin solitons [3,4] allow us to expect new kinds of spin configurations governing magnetic relaxation [5], magnetic noise and changes in its spectral 'color' under magnetic field [6], multiple magnetic resonances [7], threshold microwave power initiating bistability of the ferromagnetic resonance [8] and other unusual phenomena. Present theoretical predictions [3,4] do not always correspond to real magnetic properties of artificial chiral magnets.…”

Effect of spin-orbital interaction on continuous and jumpwise reversal magnetization in [Mn(II)(HL)(H2O)][Mn(III)(CN)6]·2H2O molecular ferrimagnet

“…Thus, metal atoms in studied compound were replaced by other atoms as well as exchange bridges were restructured. The main difference of [Mn(II)(HL)(H 2 O)][Mn(III)(CN) 6 ]2H 2 O (Brown Needle -BN) compound studied in this paper with those studied in [1,2] is strong spin-orbit interaction in Mn 3+ ions (single-ion anisotropy D  10 cm −1 [5]). In the previously studied YN magnets, weak spin-orbit coupling of Mn 2+ and Cr 3+ ions took place (single-ion anisotropy of Mn 2+ is D  0.004 cm −1 [6] [7].…”

“…), and geometry of the crystal lattice (lattice parameters) are different from the conventional inorganic magnets. Mentioned above feature of the metal organic magnets lead to the unusual effects, such as a postponed emission of magnetic noise detected in K 0.4 [Cr(CN) 6 ][Mn(R/S)-pn](R/S)-pnH 0.6 chiral ferrimagnet (Yellow needle, (YN)) [1,2]. The novelty of this phenomenon is that these magnetization jumps occur in a constant magnetic field, while Barkhausen jumps occur in a sweeping magnetic field.…”