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Muon spin relaxation measurements are reported on samples of dimethylammonium metal formates containing magnetic divalent nickel, cobalt, manganese, and copper ions. These hybrid organic-inorganic perovskites exhibit weak ferromagnetism and are, apart from the copper system, multiferroics with well-separated magnetic and antiferroelectric transitions. We use muons to follow the sublattice magnetization, observing the effect of the spin reorientation transitions below T N and the criticality approaching T N . The multiferroic samples have three-dimensional antiferromagnetic interactions but the copper sample shows quasi-onedimensional behavior due to its Jahn-Teller distorted structure with a ratio of its interchain and intrachain exchange constants ͉JЈ / J͉Ӎ0.037.

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Rare-earth element Er was deposited onto (100) oriented Zn-doped p-type InP to form Schottky barriers. The Er/p-InP Schottky barrier have been studied by current-voltage (I-V), temperature dependence of current-voltage (I-V-T), and capacitance-voltage (C-V) methods and Schottky barrier heights (SBHs) measured by I-V and I-V-T methods are in the range 0.83–0.87 eV, while SBHs measured by the C-V method are in the range 0.98–1.06 eV. Ideality factor n and series resistances R are in the range 1.08–1.11 and 30–50 Ω, respectively. Combining the experimental results of SBHs reported in the literature for Schottky barriers with various metals on p-InP (100), we conclude the Fermi level pinning for InP with (100) orientation is much stronger than that for Si or GaAs.