Loop through configurable prods children and get a custom attribute articlegroup

Magento1: loop through configurable prods children

<?php 
//loop through configurable prods children and get a custom attribute articlegroup
$_product = $this->getProduct();
$productType = $_product->getTypeID();
$articleGroup = '';
if ($productType == 'configurable') {
  $childProducts = Mage::getModel('catalog/product_type_configurable')->getChildrenIds($_product->getID());
  foreach ($childProducts[0] as $childId => $value) {
    $child = Mage::getModel('catalog/product')->load($childId);
    $articleGroup = $child->getArticlegroup();
  }
}
?>